diff --git a/lib/internal/repl.js b/lib/internal/repl.js
index cea681f5837494..6cb3fffd85f5e0 100644
--- a/lib/internal/repl.js
+++ b/lib/internal/repl.js
@@ -5,7 +5,8 @@ const REPL = require('repl');
 const path = require('path');
 const fs = require('fs');
 const os = require('os');
-const debug = require('util').debuglog('repl');
+const util = require('util');
+const debug = util.debuglog('repl');
 
 module.exports = Object.create(REPL);
 module.exports.createInternalRepl = createRepl;
@@ -19,11 +20,11 @@ function createRepl(env, opts, cb) {
     cb = opts;
     opts = null;
   }
-  opts = opts || {
+  opts = util._extend({
     ignoreUndefined: false,
     terminal: process.stdout.isTTY,
     useGlobal: true
-  };
+  }, opts);
 
   if (parseInt(env.NODE_NO_READLINE)) {
     opts.terminal = false;
diff --git a/test/parallel/test-repl-envvars.js b/test/parallel/test-repl-envvars.js
index 759b4e15a12f46..b08f6cbaf621e6 100644
--- a/test/parallel/test-repl-envvars.js
+++ b/test/parallel/test-repl-envvars.js
@@ -2,7 +2,7 @@
 
 // Flags: --expose-internals
 
-require('../common');
+const common = require('../common');
 const stream = require('stream');
 const REPL = require('internal/repl');
 const assert = require('assert');
@@ -46,6 +46,10 @@ function run(test) {
 
   REPL.createInternalRepl(env, opts, function(err, repl) {
     if (err) throw err;
+
+    // The REPL registers 'module' and 'require' globals
+    common.allowGlobals(repl.context.module, repl.context.require);
+
     assert.equal(expected.terminal, repl.terminal,
                  'Expected ' + inspect(expected) + ' with ' + inspect(env));
     assert.equal(expected.useColors, repl.useColors,
diff --git a/test/parallel/test-repl-history-perm.js b/test/parallel/test-repl-history-perm.js
index c7d2852539a01d..4a374cb0ab12e8 100644
--- a/test/parallel/test-repl-history-perm.js
+++ b/test/parallel/test-repl-history-perm.js
@@ -35,6 +35,10 @@ const replHistoryPath = path.join(common.tmpDir, '.node_repl_history');
 const checkResults = common.mustCall(function(err, r) {
   if (err)
     throw err;
+
+  // The REPL registers 'module' and 'require' globals
+  common.allowGlobals(r.context.module, r.context.require);
+
   r.input.end();
   const stat = fs.statSync(replHistoryPath);
   assert.strictEqual(
diff --git a/test/parallel/test-repl-persistent-history.js b/test/parallel/test-repl-persistent-history.js
index e8b6d416f00ec4..29ca0d56344bc9 100644
--- a/test/parallel/test-repl-persistent-history.js
+++ b/test/parallel/test-repl-persistent-history.js
@@ -262,6 +262,12 @@ function runTest(assertCleaned) {
       throw err;
     }
 
+    // The REPL registers 'module' and 'require' globals.
+    // This test also registers '_'.
+    common.allowGlobals(repl.context.module,
+                        repl.context.require,
+                        repl.context._);
+
     repl.once('close', () => {
       if (repl._flushing) {
         repl.once('flushHistory', onClose);