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diff --git a/js/src/tests/js1_5/Regress/regress-404755.js b/js/src/tests/js1_5/Regress/regress-404755.js
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+++ b/js/src/tests/js1_5/Regress/regress-404755.js
@@ -0,0 +1,50 @@
+// |reftest| skip -- unreliable - based on GC timing
+/* -*- 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 = 404755;
+var summary = 'Do not consume heap when deleting property';
+var actual = 'No leak';
+var expect = 'No leak';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+ enterFunc ('test');
+ printBugNumber(BUGNUMBER);
+ printStatus (summary);
+
+ var n = 1 << 22;
+ var o = {};
+ do {
+ o[0] = 0;
+ delete o[0];
+ } while (--n != 0);
+
+ gc();
+ var time = Date.now();
+ gc();
+ time = Date.now() - time;
+
+ o = {};
+ o[0] = 0;
+ delete o[0];
+ gc();
+ var time2 = Date.now();
+ gc();
+ time2 = Date.now() - time2;
+ print(time+" "+time2);
+ if (time > 2 && time > time2 * 5)
+ throw "A possible leak is observed";
+
+ reportCompare(expect, actual, summary);
+
+ exitFunc ('test');
+}