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diff --git a/js/src/tests/test262/built-ins/Math/log1p/length.js b/js/src/tests/test262/built-ins/Math/log1p/length.js
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+++ b/js/src/tests/test262/built-ins/Math/log1p/length.js
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+// Copyright 2015 Microsoft Corporation. All rights reserved.
+// This code is governed by the license found in the LICENSE file.
+
+/*---
+es6id: 20.2.2.21
+description: length property of Math.log1p
+info: |
+  Math.log1p ( x )
+
+  17 ECMAScript Standard Built-in Objects:
+    Every built-in Function object, including constructors, has a length
+    property whose value is an integer. Unless otherwise specified, this
+    value is equal to the largest number of named arguments shown in the
+    subclause headings for the function description, including optional
+    parameters. However, rest parameters shown using the form “...name”
+    are not included in the default argument count.
+
+    Unless otherwise specified, the length property of a built-in Function
+    object has the attributes { [[Writable]]: false, [[Enumerable]]: false,
+    [[Configurable]]: true }.
+includes: [propertyHelper.js]
+---*/
+
+assert.sameValue(Math.log1p.length, 1);
+
+verifyNotEnumerable(Math.log1p, "length");
+verifyNotWritable(Math.log1p, "length");
+verifyConfigurable(Math.log1p, "length");
+
+reportCompare(0, 0);