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diff --git a/js/src/tests/test262/built-ins/WeakSet/properties-of-the-weakset-prototype-object.js b/js/src/tests/test262/built-ins/WeakSet/properties-of-the-weakset-prototype-object.js
new file mode 100644
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+++ b/js/src/tests/test262/built-ins/WeakSet/properties-of-the-weakset-prototype-object.js
@@ -0,0 +1,23 @@
+// Copyright (C) 2015 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-properties-of-the-weakset-prototype-object
+description: >
+  The WeakSet.prototype's prototype is Object.prototype.
+info: |
+  23.4.3 Properties of the WeakSet Prototype Object
+
+  The WeakSet prototype object is the intrinsic object %WeakSetPrototype%. The
+  value of the [[Prototype]] internal slot of the WeakSet prototype object is
+  the intrinsic object %ObjectPrototype% (19.1.3). The WeakSet prototype
+  object is an ordinary object. It does not have a [[WeakSetData]] internal
+  slot.
+---*/
+
+assert.sameValue(
+  Object.getPrototypeOf(WeakSet.prototype),
+  Object.prototype,
+  '`Object.getPrototypeOf(WeakSet.prototype)` returns `Object.prototype`'
+);
+
+reportCompare(0, 0);