diff --git a/lib/plugin.js b/lib/plugin.js
index 95790e4..eb7feba 100644
--- a/lib/plugin.js
+++ b/lib/plugin.js
@@ -110,6 +110,12 @@ ManifestPlugin.prototype.apply = function(compiler) {
       }.bind(this));
     }
 
+    files = files.map(file => {
+      file.name = file.name.replace(/\\/g, '/');
+      file.path = file.path.replace(/\\/g, '/');
+      return file;
+    });
+
     if (this.opts.filter) {
       files = files.filter(this.opts.filter);
     }
diff --git a/spec/plugin.spec.js b/spec/plugin.spec.js
index 60a82ca..a319717 100644
--- a/spec/plugin.spec.js
+++ b/spec/plugin.spec.js
@@ -398,6 +398,24 @@ describe('ManifestPlugin', function() {
         done();
       });
     });
+
+    it('should output unix paths', function(done) {
+      webpackCompile({
+        context: __dirname,
+        entry: {
+          'dir\\main': './fixtures/file.js',
+          'some\\dir\\main': './fixtures/file.js'
+        }
+      }, {}, function(manifest) {
+        expect(manifest).toBeDefined();
+        expect(manifest).toEqual({
+          'dir/main.js': 'dir/main.js',
+          'some/dir/main.js': 'some/dir/main.js'
+        });
+
+        done();
+      });
+    });
   });
 
   describe('with ExtractTextPlugin', function() {