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diff --git a/js/src/tests/test262/built-ins/TypedArrayConstructors/ctors/length-arg/new-instance-extensibility.js b/js/src/tests/test262/built-ins/TypedArrayConstructors/ctors/length-arg/new-instance-extensibility.js
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+++ b/js/src/tests/test262/built-ins/TypedArrayConstructors/ctors/length-arg/new-instance-extensibility.js
@@ -0,0 +1,40 @@
+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-typedarray-length
+description: >
+  The new typedArray instance from a length argument is extensible
+info: |
+  22.2.4.2 TypedArray ( length )
+
+  This description applies only if the TypedArray function is called with at
+  least one argument and the Type of the first argument is not Object.
+
+  ...
+  8. Return ? AllocateTypedArray(constructorName, NewTarget,
+  %TypedArrayPrototype%, elementLength).
+
+  22.2.4.2.1 Runtime Semantics: AllocateTypedArray (constructorName, newTarget,
+  defaultProto [ , length ])
+
+  ...
+  2. Let obj be IntegerIndexedObjectCreate(proto, « [[ViewedArrayBuffer]],
+  [[TypedArrayName]], [[ByteLength]], [[ByteOffset]], [[ArrayLength]] »).
+  ...
+
+  9.4.5.7 IntegerIndexedObjectCreate (prototype, internalSlotsList)
+
+  ...
+  11. Set the [[Extensible]] internal slot of A to true.
+  ...
+includes: [testTypedArray.js]
+features: [TypedArray]
+---*/
+
+testWithTypedArrayConstructors(function(TA) {
+  var sample = new TA(4);
+
+  assert(Object.isExtensible(sample));
+});
+
+reportCompare(0, 0);