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diff --git a/js/src/tests/test262/built-ins/Promise/reject-function-extensible.js b/js/src/tests/test262/built-ins/Promise/reject-function-extensible.js
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+++ b/js/src/tests/test262/built-ins/Promise/reject-function-extensible.js
@@ -0,0 +1,20 @@
+// Copyright (C) 2015 André Bargull. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+es6id: 25.4.1.3.1
+description: The [[Extensible]] slot of Promise Reject functions
+info: |
+  17 ECMAScript Standard Built-in Objects:
+    Unless specified otherwise, the [[Extensible]] internal slot
+    of a built-in object initially has the value true.
+---*/
+
+var rejectFunction;
+new Promise(function(resolve, reject) {
+  rejectFunction = reject;
+});
+
+assert(Object.isExtensible(rejectFunction));
+
+reportCompare(0, 0);