diff --git a/js/tests/js1_5/GC/regress-311497.js b/js/tests/js1_5/GC/regress-311497.js
new file mode 100755
index 00000000000..284c1442e81
--- /dev/null
+++ b/js/tests/js1_5/GC/regress-311497.js
@@ -0,0 +1,92 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is JavaScript Engine testing utilities.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2005
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Igor Bukanov
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+//-----------------------------------------------------------------------------
+var bug = 311497;
+var summary = 'Root pivots in js_HeapSort';
+var actual = 'No Crash';
+var expect = 'No Crash';
+
+printBugNumber (bug);
+printStatus (summary);
+
+
+function force_gc()
+{
+    if (this.gc) gc();
+    for (var i = 0; i != 30000; ++i) {
+        var tmp = Math.sin(i);
+        tmp = null;
+    }
+}
+
+var array = new Array(10);
+for (var i = 0; i != array.length; ++i) {
+    array[i] = String.fromCharCode(i, i, i);
+}
+
+function cmp(a, b)
+{
+    for (var i = 0; i != array.length; ++i) {
+        array[i] = null;
+    }
+    force_gc();
+    return 0;
+}
+
+array.sort(cmp);
+
+// Verify that array contains either null or original strings
+
+var null_count = 0;
+var original_string_count = 0;
+for (var i = 0; i != array.length; ++i) {
+    var elem = array[i];
+    if (elem === null) {
+        ++null_count;
+    } else if (typeof elem == "string" && elem.length == 3) {
+        var code = elem.charCodeAt(0);
+        if (0 <= code && code < array.length) {
+            if (code === elem.charCodeAt(1) && code == elem.charCodeAt(2))
+	            ++original_string_count;
+        }
+    }
+}
+
+var expect = array.length;
+var actual = null_count + original_string_count;
+
+reportCompare(expect, actual, summary);