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diff --git a/js/src/tests/js1_8_1/jit/regress-469927.js b/js/src/tests/js1_8_1/jit/regress-469927.js
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+++ b/js/src/tests/js1_8_1/jit/regress-469927.js
@@ -0,0 +1,44 @@
+// |reftest| skip -- bogus perf test (bug 540512)
+/* -*- 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 = 469927;
+var summary = 'TM: jit should not slow down short loop with let';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+ enterFunc ('test');
+ printBugNumber(BUGNUMBER);
+ printStatus (summary);
+
+ function letitbe() {
+ var start = new Date();
+ for (let i = 0; i < 500000; ++i) {
+ for (let j = 0; j < 4; ++j) { }
+ }
+ var stop = new Date();
+ return stop - start;
+ }
+
+ var timenonjit = letitbe();
+ var timejit = letitbe();
+
+ print('time: nonjit = ' + timenonjit + ', jit = ' + timejit);
+
+ expect = true;
+ actual = timejit < timenonjit;
+
+ reportCompare(expect, actual, summary);
+
+ exitFunc ('test');
+}