diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-245113.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-245113.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,47 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 245113;
+var summary = 'instanceof operator should return false for class prototype';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+Date.prototype.test = function() {
+  return (this instanceof Date);
+};
+
+String.prototype.test = function() {
+  return (this instanceof String);
+};
+
+status = summary + inSection(1);
+expect = false;
+actual = (Date.prototype.test instanceof Date);
+reportCompare(expect, actual, status);
+
+status = summary + inSection(2);
+expect = false;
+actual = Date.prototype.test();
+reportCompare(expect, actual, status);
+
+status = summary + inSection(3);
+expect = false;
+actual = String.prototype.test();
+reportCompare(expect, actual, status);
+
+status = summary + inSection(4);
+expect = true;
+actual = (new Date()).test();
+reportCompare(expect, actual, status);
+
+status = summary + inSection(5);
+expect = true;
+actual = (new String()).test();
+reportCompare(expect, actual, status);
+