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diff --git a/js/src/tests/test262/built-ins/TypedArrayConstructors/internals/DefineOwnProperty/tonumber-value-detached-buffer.js b/js/src/tests/test262/built-ins/TypedArrayConstructors/internals/DefineOwnProperty/tonumber-value-detached-buffer.js
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+++ b/js/src/tests/test262/built-ins/TypedArrayConstructors/internals/DefineOwnProperty/tonumber-value-detached-buffer.js
@@ -0,0 +1,64 @@
+// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+esid: sec-integer-indexed-exotic-objects-defineownproperty-p-desc
+description: >
+    Defining a typed array element to a value that, when converted to the typed
+    array element type, detaches the typed array's underlying buffer, should
+    return true and not modify the typed array.
+info: |
+  9.4.5.3 [[DefineOwnProperty]] ( P, Desc )
+
+  ...
+  3. If Type(P) is String, then
+    a. Let numericIndex be ! CanonicalNumericIndexString(P).
+    b. If numericIndex is not undefined, then
+      ...
+      x. If Desc has a [[Value]] field, then
+        1. Let value be Desc.[[Value]].
+        2. Return ? IntegerIndexedElementSet(O, numericIndex, value).
+  ...
+
+  IntegerIndexedElementSet ( O, index, value )
+
+  Assert: O is an Integer-Indexed exotic object.
+  If O.[[ContentType]] is BigInt, let numValue be ? ToBigInt(value).
+  Otherwise, let numValue be ? ToNumber(value).
+  Let buffer be O.[[ViewedArrayBuffer]].
+  If IsDetachedBuffer(buffer) is false and ! IsValidIntegerIndex(O, index) is true, then
+    Let offset be O.[[ByteOffset]].
+    Let arrayTypeName be the String value of O.[[TypedArrayName]].
+    Let elementSize be the Element Size value specified in Table 62 for arrayTypeName.
+    Let indexedPosition be (ℝ(index) × elementSize) + offset.
+    Let elementType be the Element Type value in Table 62 for arrayTypeName.
+    Perform SetValueInBuffer(buffer, indexedPosition, elementType, numValue, true, Unordered).
+  Return NormalCompletion(undefined).
+
+includes: [testTypedArray.js, detachArrayBuffer.js]
+features: [align-detached-buffer-semantics-with-web-reality, Reflect, TypedArray]
+---*/
+
+testWithTypedArrayConstructors(function(TA) {
+  var ta = new TA([17]);
+
+  var desc =
+    {
+      value: {
+        valueOf() {
+          $DETACHBUFFER(ta.buffer);
+          return 42;
+        }
+      }
+    };
+
+  assert.sameValue(
+    Reflect.defineProperty(ta, 0, desc),
+    true,
+    'Reflect.defineProperty(ta, 0, {value: {valueOf() {$DETACHBUFFER(ta.buffer); return 42;}}} ) must return true'
+  );
+  assert.sameValue(ta[0], undefined, 'The value of ta[0] is expected to equal `undefined`');
+});
+
+
+reportCompare(0, 0);