diff --git a/src/js/harmony-unicode-regexps.js b/src/js/harmony-unicode-regexps.js
new file mode 100644
index 0000000..b24bbdf
--- /dev/null
+++ b/src/js/harmony-unicode-regexps.js
@@ -0,0 +1,41 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+(function(global, utils) {
+
+'use strict';
+
+%CheckIsBootstrapping();
+
+// -------------------------------------------------------------------
+// Imports
+
+var GlobalRegExp = global.RegExp;
+var GlobalRegExpPrototype = GlobalRegExp.prototype;
+var MakeTypeError;
+
+utils.Import(function(from) {
+  MakeTypeError = from.MakeTypeError;
+});
+
+// -------------------------------------------------------------------
+
+// ES6 21.2.5.15.
+function RegExpGetUnicode() {
+  if (!IS_REGEXP(this)) {
+    // TODO(littledan): Remove this RegExp compat workaround
+    if (this === GlobalRegExpPrototype) {
+      %IncrementUseCounter(kRegExpPrototypeUnicodeGetter);
+      return UNDEFINED;
+    }
+    throw MakeTypeError(kRegExpNonRegExp, "RegExp.prototype.unicode");
+  }
+  return !!REGEXP_UNICODE(this);
+}
+%FunctionSetName(RegExpGetUnicode, "RegExp.prototype.unicode");
+%SetNativeFlag(RegExpGetUnicode);
+
+utils.InstallGetter(GlobalRegExp.prototype, 'unicode', RegExpGetUnicode);
+
+})