diff --git a/doc/api/deprecations.md b/doc/api/deprecations.md
index 257b5afb65b4e4..e5495fa5ceb587 100644
--- a/doc/api/deprecations.md
+++ b/doc/api/deprecations.md
@@ -710,6 +710,16 @@ function for [`util.inspect()`][] is deprecated. Use [`util.inspect.custom`][]
 instead. For backwards compatibility with Node.js prior to version 6.4.0, both
 may be specified.
 
+<a id="DEP00XX"></a>
+### DEP00XX: path.\_makeLong()
+
+Type: Documentation-only
+
+The internal `path._makeLong()` was not intended for public use. However,
+userland modules have found it useful. The internal API has been deprecated
+and replaced with an identical, public `path.toNamespacedPath()` method.
+
+
 [`Buffer.allocUnsafeSlow(size)`]: buffer.html#buffer_class_method_buffer_allocunsafeslow_size
 [`Buffer.from(array)`]: buffer.html#buffer_class_method_buffer_from_array
 [`Buffer.from(buffer)`]: buffer.html#buffer_class_method_buffer_from_buffer
diff --git a/doc/api/path.md b/doc/api/path.md
index f2015db47048d7..b072ad8135cd3b 100644
--- a/doc/api/path.md
+++ b/doc/api/path.md
@@ -543,6 +543,21 @@ On Windows:
 accepted as path segment separators; however, the `path` methods only add
 backward slashes (`\`).
 
+## path.toNamespacedPath(path)
+<!-- YAML
+added: REPLACEME
+-->
+
+* `path` {string}
+* Returns: {string}
+
+On Windows systems only, returns an equivalent [namespace-prefixed path][] for
+the given `path`. If `path` is not a string, `path` will be returned without
+modifications.
+
+This method is meaningful only on Windows system. On posix systems, the
+method is non-operational and always returns `path` without modifications.
+
 ## path.win32
 <!-- YAML
 added: v0.11.15
@@ -559,3 +574,4 @@ of the `path` methods.
 [`path.sep`]: #path_path_sep
 [`path.win32`]: #path_path_win32
 [MSDN-Rel-Path]: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365247.aspx#fully_qualified_vs._relative_paths
+[namespace-prefixed path]: https://msdn.microsoft.com/library/windows/desktop/aa365247(v=vs.85).aspx#namespaces
diff --git a/lib/fs.js b/lib/fs.js
index 5521094431456b..b7a2bbba0ce82e 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -293,7 +293,7 @@ fs.access = function(path, mode, callback) {
   mode = mode | 0;
   var req = new FSReqWrap();
   req.oncomplete = makeCallback(callback);
-  binding.access(pathModule._makeLong(path), mode, req);
+  binding.access(pathModule.toNamespacedPath(path), mode, req);
 };
 
 fs.accessSync = function(path, mode) {
@@ -305,7 +305,7 @@ fs.accessSync = function(path, mode) {
   else
     mode = mode | 0;
 
-  binding.access(pathModule._makeLong(path), mode);
+  binding.access(pathModule.toNamespacedPath(path), mode);
 };
 
 fs.exists = function(path, callback) {
@@ -314,7 +314,7 @@ fs.exists = function(path, callback) {
   if (!nullCheck(path, cb)) return;
   var req = new FSReqWrap();
   req.oncomplete = cb;
-  binding.stat(pathModule._makeLong(path), req);
+  binding.stat(pathModule.toNamespacedPath(path), req);
   function cb(err) {
     if (callback) callback(err ? false : true);
   }
@@ -333,7 +333,7 @@ fs.existsSync = function(path) {
   try {
     handleError((path = getPathFromURL(path)));
     nullCheck(path);
-    binding.stat(pathModule._makeLong(path));
+    binding.stat(pathModule.toNamespacedPath(path));
     return true;
   } catch (e) {
     return false;
@@ -362,7 +362,7 @@ fs.readFile = function(path, options, callback) {
     return;
   }
 
-  binding.open(pathModule._makeLong(path),
+  binding.open(pathModule.toNamespacedPath(path),
                stringToFlags(options.flag || 'r'),
                0o666,
                req);
@@ -646,7 +646,7 @@ fs.open = function(path, flags, mode, callback_) {
   var req = new FSReqWrap();
   req.oncomplete = callback;
 
-  binding.open(pathModule._makeLong(path),
+  binding.open(pathModule.toNamespacedPath(path),
                stringToFlags(flags),
                mode,
                req);
@@ -656,7 +656,8 @@ fs.openSync = function(path, flags, mode) {
   mode = modeNum(mode, 0o666);
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
-  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
+  return binding.open(pathModule.toNamespacedPath(path),
+                      stringToFlags(flags), mode);
 };
 
 fs.read = function(fd, buffer, offset, length, position, callback) {
@@ -766,8 +767,8 @@ fs.rename = function(oldPath, newPath, callback) {
   if (!nullCheck(newPath, callback)) return;
   var req = new FSReqWrap();
   req.oncomplete = callback;
-  binding.rename(pathModule._makeLong(oldPath),
-                 pathModule._makeLong(newPath),
+  binding.rename(pathModule.toNamespacedPath(oldPath),
+                 pathModule.toNamespacedPath(newPath),
                  req);
 };
 
@@ -776,8 +777,8 @@ fs.renameSync = function(oldPath, newPath) {
   handleError((newPath = getPathFromURL(newPath)));
   nullCheck(oldPath);
   nullCheck(newPath);
-  return binding.rename(pathModule._makeLong(oldPath),
-                        pathModule._makeLong(newPath));
+  return binding.rename(pathModule.toNamespacedPath(oldPath),
+                        pathModule.toNamespacedPath(newPath));
 };
 
 fs.truncate = function(path, len, callback) {
@@ -850,13 +851,13 @@ fs.rmdir = function(path, callback) {
   if (!nullCheck(path, callback)) return;
   var req = new FSReqWrap();
   req.oncomplete = callback;
-  binding.rmdir(pathModule._makeLong(path), req);
+  binding.rmdir(pathModule.toNamespacedPath(path), req);
 };
 
 fs.rmdirSync = function(path) {
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
-  return binding.rmdir(pathModule._makeLong(path));
+  return binding.rmdir(pathModule.toNamespacedPath(path));
 };
 
 fs.fdatasync = function(fd, callback) {
@@ -887,7 +888,7 @@ fs.mkdir = function(path, mode, callback) {
   if (!nullCheck(path, callback)) return;
   var req = new FSReqWrap();
   req.oncomplete = callback;
-  binding.mkdir(pathModule._makeLong(path),
+  binding.mkdir(pathModule.toNamespacedPath(path),
                 modeNum(mode, 0o777),
                 req);
 };
@@ -895,7 +896,7 @@ fs.mkdir = function(path, mode, callback) {
 fs.mkdirSync = function(path, mode) {
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
-  return binding.mkdir(pathModule._makeLong(path),
+  return binding.mkdir(pathModule.toNamespacedPath(path),
                        modeNum(mode, 0o777));
 };
 
@@ -907,14 +908,14 @@ fs.readdir = function(path, options, callback) {
   if (!nullCheck(path, callback)) return;
   var req = new FSReqWrap();
   req.oncomplete = callback;
-  binding.readdir(pathModule._makeLong(path), options.encoding, req);
+  binding.readdir(pathModule.toNamespacedPath(path), options.encoding, req);
 };
 
 fs.readdirSync = function(path, options) {
   options = getOptions(options, {});
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
-  return binding.readdir(pathModule._makeLong(path), options.encoding);
+  return binding.readdir(pathModule.toNamespacedPath(path), options.encoding);
 };
 
 fs.fstat = function(fd, callback) {
@@ -930,7 +931,7 @@ fs.lstat = function(path, callback) {
   if (!nullCheck(path, callback)) return;
   var req = new FSReqWrap();
   req.oncomplete = callback;
-  binding.lstat(pathModule._makeLong(path), req);
+  binding.lstat(pathModule.toNamespacedPath(path), req);
 };
 
 fs.stat = function(path, callback) {
@@ -940,7 +941,7 @@ fs.stat = function(path, callback) {
   if (!nullCheck(path, callback)) return;
   var req = new FSReqWrap();
   req.oncomplete = callback;
-  binding.stat(pathModule._makeLong(path), req);
+  binding.stat(pathModule.toNamespacedPath(path), req);
 };
 
 fs.fstatSync = function(fd) {
@@ -951,14 +952,14 @@ fs.fstatSync = function(fd) {
 fs.lstatSync = function(path) {
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
-  binding.lstat(pathModule._makeLong(path));
+  binding.lstat(pathModule.toNamespacedPath(path));
   return statsFromValues();
 };
 
 fs.statSync = function(path) {
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
-  binding.stat(pathModule._makeLong(path));
+  binding.stat(pathModule.toNamespacedPath(path));
   return statsFromValues();
 };
 
@@ -970,14 +971,14 @@ fs.readlink = function(path, options, callback) {
   if (!nullCheck(path, callback)) return;
   var req = new FSReqWrap();
   req.oncomplete = callback;
-  binding.readlink(pathModule._makeLong(path), options.encoding, req);
+  binding.readlink(pathModule.toNamespacedPath(path), options.encoding, req);
 };
 
 fs.readlinkSync = function(path, options) {
   options = getOptions(options, {});
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
-  return binding.readlink(pathModule._makeLong(path), options.encoding);
+  return binding.readlink(pathModule.toNamespacedPath(path), options.encoding);
 };
 
 function preprocessSymlinkDestination(path, type, linkPath) {
@@ -988,7 +989,7 @@ function preprocessSymlinkDestination(path, type, linkPath) {
     // Junctions paths need to be absolute and \\?\-prefixed.
     // A relative target is relative to the link's parent directory.
     path = pathModule.resolve(linkPath, '..', path);
-    return pathModule._makeLong(path);
+    return pathModule.toNamespacedPath(path);
   } else {
     // Windows symlinks don't tolerate forward slashes.
     return ('' + path).replace(/\//g, '\\');
@@ -1012,7 +1013,7 @@ fs.symlink = function(target, path, type_, callback_) {
   req.oncomplete = callback;
 
   binding.symlink(preprocessSymlinkDestination(target, type, path),
-                  pathModule._makeLong(path),
+                  pathModule.toNamespacedPath(path),
                   type,
                   req);
 };
@@ -1025,7 +1026,7 @@ fs.symlinkSync = function(target, path, type) {
   nullCheck(path);
 
   return binding.symlink(preprocessSymlinkDestination(target, type, path),
-                         pathModule._makeLong(path),
+                         pathModule.toNamespacedPath(path),
                          type);
 };
 
@@ -1044,8 +1045,8 @@ fs.link = function(existingPath, newPath, callback) {
   var req = new FSReqWrap();
   req.oncomplete = callback;
 
-  binding.link(pathModule._makeLong(existingPath),
-               pathModule._makeLong(newPath),
+  binding.link(pathModule.toNamespacedPath(existingPath),
+               pathModule.toNamespacedPath(newPath),
                req);
 };
 
@@ -1054,8 +1055,8 @@ fs.linkSync = function(existingPath, newPath) {
   handleError((newPath = getPathFromURL(newPath)));
   nullCheck(existingPath);
   nullCheck(newPath);
-  return binding.link(pathModule._makeLong(existingPath),
-                      pathModule._makeLong(newPath));
+  return binding.link(pathModule.toNamespacedPath(existingPath),
+                      pathModule.toNamespacedPath(newPath));
 };
 
 fs.unlink = function(path, callback) {
@@ -1065,13 +1066,13 @@ fs.unlink = function(path, callback) {
   if (!nullCheck(path, callback)) return;
   var req = new FSReqWrap();
   req.oncomplete = callback;
-  binding.unlink(pathModule._makeLong(path), req);
+  binding.unlink(pathModule.toNamespacedPath(path), req);
 };
 
 fs.unlinkSync = function(path) {
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
-  return binding.unlink(pathModule._makeLong(path));
+  return binding.unlink(pathModule.toNamespacedPath(path));
 };
 
 fs.fchmod = function(fd, mode, callback) {
@@ -1129,7 +1130,7 @@ fs.chmod = function(path, mode, callback) {
   if (!nullCheck(path, callback)) return;
   var req = new FSReqWrap();
   req.oncomplete = callback;
-  binding.chmod(pathModule._makeLong(path),
+  binding.chmod(pathModule.toNamespacedPath(path),
                 modeNum(mode),
                 req);
 };
@@ -1137,7 +1138,7 @@ fs.chmod = function(path, mode, callback) {
 fs.chmodSync = function(path, mode) {
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
-  return binding.chmod(pathModule._makeLong(path), modeNum(mode));
+  return binding.chmod(pathModule.toNamespacedPath(path), modeNum(mode));
 };
 
 if (constants.O_SYMLINK !== undefined) {
@@ -1175,13 +1176,13 @@ fs.chown = function(path, uid, gid, callback) {
   if (!nullCheck(path, callback)) return;
   var req = new FSReqWrap();
   req.oncomplete = callback;
-  binding.chown(pathModule._makeLong(path), uid, gid, req);
+  binding.chown(pathModule.toNamespacedPath(path), uid, gid, req);
 };
 
 fs.chownSync = function(path, uid, gid) {
   handleError((path = getPathFromURL(path)));
   nullCheck(path);
-  return binding.chown(pathModule._makeLong(path), uid, gid);
+  return binding.chown(pathModule.toNamespacedPath(path), uid, gid);
 };
 
 // converts Date or number to a fractional UNIX timestamp
@@ -1216,7 +1217,7 @@ fs.utimes = function(path, atime, mtime, callback) {
   if (!nullCheck(path, callback)) return;
   var req = new FSReqWrap();
   req.oncomplete = callback;
-  binding.utimes(pathModule._makeLong(path),
+  binding.utimes(pathModule.toNamespacedPath(path),
                  toUnixTimestamp(atime),
                  toUnixTimestamp(mtime),
                  req);
@@ -1227,7 +1228,7 @@ fs.utimesSync = function(path, atime, mtime) {
   nullCheck(path);
   atime = toUnixTimestamp(atime);
   mtime = toUnixTimestamp(mtime);
-  binding.utimes(pathModule._makeLong(path), atime, mtime);
+  binding.utimes(pathModule.toNamespacedPath(path), atime, mtime);
 };
 
 fs.futimes = function(fd, atime, mtime, callback) {
@@ -1383,7 +1384,7 @@ FSWatcher.prototype.start = function(filename,
                                      encoding) {
   handleError((filename = getPathFromURL(filename)));
   nullCheck(filename);
-  var err = this._handle.start(pathModule._makeLong(filename),
+  var err = this._handle.start(pathModule.toNamespacedPath(filename),
                                persistent,
                                recursive,
                                encoding);
@@ -1472,7 +1473,8 @@ util.inherits(StatWatcher, EventEmitter);
 StatWatcher.prototype.start = function(filename, persistent, interval) {
   handleError((filename = getPathFromURL(filename)));
   nullCheck(filename);
-  this._handle.start(pathModule._makeLong(filename), persistent, interval);
+  this._handle.start(pathModule.toNamespacedPath(filename),
+                     persistent, interval);
 };
 
 
@@ -1627,7 +1629,7 @@ fs.realpathSync = function realpathSync(p, options) {
 
   // On windows, check that the root exists. On unix there is no need.
   if (isWindows && !knownHard[base]) {
-    binding.lstat(pathModule._makeLong(base));
+    binding.lstat(pathModule.toNamespacedPath(base));
     knownHard[base] = true;
   }
 
@@ -1666,7 +1668,7 @@ fs.realpathSync = function realpathSync(p, options) {
       // Use stats array directly to avoid creating an fs.Stats instance just
       // for our internal use.
 
-      var baseLong = pathModule._makeLong(base);
+      var baseLong = pathModule.toNamespacedPath(base);
       binding.lstat(baseLong);
 
       if ((statValues[1/*mode*/] & S_IFMT) !== S_IFLNK) {
@@ -1706,7 +1708,7 @@ fs.realpathSync = function realpathSync(p, options) {
 
     // On windows, check that the root exists. On unix there is no need.
     if (isWindows && !knownHard[base]) {
-      binding.lstat(pathModule._makeLong(base));
+      binding.lstat(pathModule.toNamespacedPath(base));
       knownHard[base] = true;
     }
   }
diff --git a/lib/module.js b/lib/module.js
index 7f25b63ddb8bf6..6693bedeb1c7b6 100644
--- a/lib/module.js
+++ b/lib/module.js
@@ -43,7 +43,7 @@ const { createDynamicModule } = require('internal/loader/ModuleWrap');
 const ESMLoader = new Loader();
 
 function stat(filename) {
-  filename = path._makeLong(filename);
+  filename = path.toNamespacedPath(filename);
   const cache = stat.cache;
   if (cache !== null) {
     const result = cache.get(filename);
@@ -106,7 +106,7 @@ function readPackage(requestPath) {
     return entry;
 
   const jsonPath = path.resolve(requestPath, 'package.json');
-  const json = internalModuleReadFile(path._makeLong(jsonPath));
+  const json = internalModuleReadFile(path.toNamespacedPath(jsonPath));
 
   if (json === undefined) {
     return false;
@@ -626,7 +626,7 @@ Module._extensions['.json'] = function(module, filename) {
 
 //Native extension for .node
 Module._extensions['.node'] = function(module, filename) {
-  return process.dlopen(module, path._makeLong(filename));
+  return process.dlopen(module, path.toNamespacedPath(filename));
 };
 
 if (experimentalModules) {
diff --git a/lib/path.js b/lib/path.js
index 9ac8a2450b7553..c9ed0120d8697f 100644
--- a/lib/path.js
+++ b/lib/path.js
@@ -687,7 +687,7 @@ const win32 = {
   },
 
 
-  _makeLong: function _makeLong(path) {
+  toNamespacedPath: function toNamespacedPath(path) {
     // Note: this will *probably* throw somewhere.
     if (typeof path !== 'string')
       return path;
@@ -725,7 +725,6 @@ const win32 = {
     return path;
   },
 
-
   dirname: function dirname(path) {
     assertPath(path);
     const len = path.length;
@@ -1356,11 +1355,11 @@ const posix = {
   },
 
 
-  _makeLong: function _makeLong(path) {
+  toNamespacedPath: function toNamespacedPath(path) {
+    // Non-op on posix systems
     return path;
   },
 
-
   dirname: function dirname(path) {
     assertPath(path);
     if (path.length === 0)
@@ -1630,6 +1629,9 @@ const posix = {
 posix.win32 = win32.win32 = win32;
 posix.posix = win32.posix = posix;
 
+// Legacy internal API, docs-only deprecated: DEP00XX
+win32._makeLong = win32.toNamespacedPath;
+posix._makeLong = posix.toNamespacedPath;
 
 if (process.platform === 'win32')
   module.exports = win32;
diff --git a/test/parallel/test-path-makelong.js b/test/parallel/test-path-makelong.js
index 0358e0e6e0669d..99e3454bb3a684 100644
--- a/test/parallel/test-path-makelong.js
+++ b/test/parallel/test-path-makelong.js
@@ -28,53 +28,56 @@ if (common.isWindows) {
   const file = path.join(common.fixturesDir, 'a.js');
   const resolvedFile = path.resolve(file);
 
-  assert.strictEqual(`\\\\?\\${resolvedFile}`, path._makeLong(file));
   assert.strictEqual(`\\\\?\\${resolvedFile}`,
-                     path._makeLong(`\\\\?\\${file}`));
+                     path.toNamespacedPath(file));
+  assert.strictEqual(`\\\\?\\${resolvedFile}`,
+                     path.toNamespacedPath(`\\\\?\\${file}`));
   assert.strictEqual('\\\\?\\UNC\\someserver\\someshare\\somefile',
-                     path._makeLong('\\\\someserver\\someshare\\somefile'));
+                     path.toNamespacedPath(
+                       '\\\\someserver\\someshare\\somefile'));
   assert.strictEqual('\\\\?\\UNC\\someserver\\someshare\\somefile', path
-    ._makeLong('\\\\?\\UNC\\someserver\\someshare\\somefile'));
+    .toNamespacedPath('\\\\?\\UNC\\someserver\\someshare\\somefile'));
   assert.strictEqual('\\\\.\\pipe\\somepipe',
-                     path._makeLong('\\\\.\\pipe\\somepipe'));
+                     path.toNamespacedPath('\\\\.\\pipe\\somepipe'));
 }
 
-assert.strictEqual(path._makeLong(null), null);
-assert.strictEqual(path._makeLong(100), 100);
-assert.strictEqual(path._makeLong(path), path);
-assert.strictEqual(path._makeLong(false), false);
-assert.strictEqual(path._makeLong(true), true);
+assert.strictEqual(path.toNamespacedPath(null), null);
+assert.strictEqual(path.toNamespacedPath(100), 100);
+assert.strictEqual(path.toNamespacedPath(path), path);
+assert.strictEqual(path.toNamespacedPath(false), false);
+assert.strictEqual(path.toNamespacedPath(true), true);
 
 const emptyObj = {};
-assert.strictEqual(path.posix._makeLong('/foo/bar'), '/foo/bar');
-assert.strictEqual(path.posix._makeLong('foo/bar'), 'foo/bar');
-assert.strictEqual(path.posix._makeLong(null), null);
-assert.strictEqual(path.posix._makeLong(true), true);
-assert.strictEqual(path.posix._makeLong(1), 1);
-assert.strictEqual(path.posix._makeLong(), undefined);
-assert.strictEqual(path.posix._makeLong(emptyObj), emptyObj);
+assert.strictEqual(path.posix.toNamespacedPath('/foo/bar'), '/foo/bar');
+assert.strictEqual(path.posix.toNamespacedPath('foo/bar'), 'foo/bar');
+assert.strictEqual(path.posix.toNamespacedPath(null), null);
+assert.strictEqual(path.posix.toNamespacedPath(true), true);
+assert.strictEqual(path.posix.toNamespacedPath(1), 1);
+assert.strictEqual(path.posix.toNamespacedPath(), undefined);
+assert.strictEqual(path.posix.toNamespacedPath(emptyObj), emptyObj);
 if (common.isWindows) {
   // These tests cause resolve() to insert the cwd, so we cannot test them from
   // non-Windows platforms (easily)
-  assert.strictEqual(path.win32._makeLong('foo\\bar').toLowerCase(),
+  assert.strictEqual(path.win32.toNamespacedPath('foo\\bar').toLowerCase(),
                      `\\\\?\\${process.cwd().toLowerCase()}\\foo\\bar`);
-  assert.strictEqual(path.win32._makeLong('foo/bar').toLowerCase(),
+  assert.strictEqual(path.win32.toNamespacedPath('foo/bar').toLowerCase(),
                      `\\\\?\\${process.cwd().toLowerCase()}\\foo\\bar`);
   const currentDeviceLetter = path.parse(process.cwd()).root.substring(0, 2);
-  assert.strictEqual(path.win32._makeLong(currentDeviceLetter).toLowerCase(),
-                     `\\\\?\\${process.cwd().toLowerCase()}`);
-  assert.strictEqual(path.win32._makeLong('C').toLowerCase(),
+  assert.strictEqual(
+    path.win32.toNamespacedPath(currentDeviceLetter).toLowerCase(),
+    `\\\\?\\${process.cwd().toLowerCase()}`);
+  assert.strictEqual(path.win32.toNamespacedPath('C').toLowerCase(),
                      `\\\\?\\${process.cwd().toLowerCase()}\\c`);
 }
-assert.strictEqual(path.win32._makeLong('C:\\foo'), '\\\\?\\C:\\foo');
-assert.strictEqual(path.win32._makeLong('C:/foo'), '\\\\?\\C:\\foo');
-assert.strictEqual(path.win32._makeLong('\\\\foo\\bar'),
+assert.strictEqual(path.win32.toNamespacedPath('C:\\foo'), '\\\\?\\C:\\foo');
+assert.strictEqual(path.win32.toNamespacedPath('C:/foo'), '\\\\?\\C:\\foo');
+assert.strictEqual(path.win32.toNamespacedPath('\\\\foo\\bar'),
                    '\\\\?\\UNC\\foo\\bar\\');
-assert.strictEqual(path.win32._makeLong('//foo//bar'),
+assert.strictEqual(path.win32.toNamespacedPath('//foo//bar'),
                    '\\\\?\\UNC\\foo\\bar\\');
-assert.strictEqual(path.win32._makeLong('\\\\?\\foo'), '\\\\?\\foo');
-assert.strictEqual(path.win32._makeLong(null), null);
-assert.strictEqual(path.win32._makeLong(true), true);
-assert.strictEqual(path.win32._makeLong(1), 1);
-assert.strictEqual(path.win32._makeLong(), undefined);
-assert.strictEqual(path.win32._makeLong(emptyObj), emptyObj);
+assert.strictEqual(path.win32.toNamespacedPath('\\\\?\\foo'), '\\\\?\\foo');
+assert.strictEqual(path.win32.toNamespacedPath(null), null);
+assert.strictEqual(path.win32.toNamespacedPath(true), true);
+assert.strictEqual(path.win32.toNamespacedPath(1), 1);
+assert.strictEqual(path.win32.toNamespacedPath(), undefined);
+assert.strictEqual(path.win32.toNamespacedPath(emptyObj), emptyObj);
diff --git a/test/sequential/test-async-wrap-getasyncid.js b/test/sequential/test-async-wrap-getasyncid.js
index 801aa2f5013045..dadbc2107b3f3b 100644
--- a/test/sequential/test-async-wrap-getasyncid.js
+++ b/test/sequential/test-async-wrap-getasyncid.js
@@ -118,7 +118,7 @@ if (common.hasCrypto) { // eslint-disable-line crypto-check
   req.oncomplete = () => { };
 
   testUninitialized(req, 'FSReqWrap');
-  binding.access(path._makeLong('../'), fs.F_OK, req);
+  binding.access(path.toNamespacedPath('../'), fs.F_OK, req);
   testInitialized(req, 'FSReqWrap');
 
   const StatWatcher = binding.StatWatcher;