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diff --git a/js/src/tests/ecma/extensions/15.7.4.js b/js/src/tests/ecma/extensions/15.7.4.js
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+/* -*- tab-width: 2; indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+/**
+   File Name:          15.7.4.js
+   ECMA Section:       15.7.4
+
+   Description:
+
+   The Number prototype object is itself a Number object (its [[Class]] is
+   "Number") whose value is +0.
+
+   The value of the internal [[Prototype]] property of the Number prototype
+   object is the Object prototype object (15.2.3.1).
+
+   In following descriptions of functions that are properties of the Number
+   prototype object, the phrase "this Number object" refers to the object
+   that is the this value for the invocation of the function; it is an error
+   if this does not refer to an object for which the value of the internal
+   [[Class]] property is "Number". Also, the phrase "this number value" refers
+   to the number value represented by this Number object, that is, the value
+   of the internal [[Value]] property of this Number object.
+
+   Author:             christine@netscape.com
+   Date:               12 november 1997
+*/
+var SECTION = "15.7.4";
+var VERSION = "ECMA_1";
+startTest();
+var TITLE   = "Properties of the Number Prototype Object";
+
+writeHeaderToLog( SECTION + " "+TITLE);
+
+new TestCase( SECTION,
+	      "Number.prototype.toString=Object.prototype.toString;Number.prototype.toString()",
+	      "[object Number]",
+	      eval("Number.prototype.toString=Object.prototype.toString;Number.prototype.toString()") );
+
+new TestCase( SECTION,
+	      "typeof Number.prototype",  
+	      "object",
+	      typeof Number.prototype );
+
+new TestCase( SECTION,
+	      "Number.prototype.valueOf()", 
+	      0,
+	      Number.prototype.valueOf() );
+
+//    The __proto__ property cannot be used in ECMA_1 tests.
+//    new TestCase( SECTION, "Number.prototype.__proto__",                        Object.prototype,   Number.prototype.__proto__ );
+//    new TestCase( SECTION, "Number.prototype.__proto__ == Object.prototype",    true,       Number.prototype.__proto__ == Object.prototype );
+
+test();