diff --git a/test/built-ins/RegExp/prototype/lastIndex/15.10.7.5-1.js b/test/built-ins/RegExp/prototype/lastIndex/15.10.7.5-1.js
deleted file mode 100644
index 90e2f09b43ad3221439346faea8b198768d93f5f..0000000000000000000000000000000000000000
--- a/test/built-ins/RegExp/prototype/lastIndex/15.10.7.5-1.js
+++ /dev/null
@@ -1,9 +0,0 @@
-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-es5id: 15.10.7.5-1
-description: RegExp.prototype.lastIndex is of type Undefined
----*/
-
-assert.sameValue(typeof(RegExp.prototype.lastIndex), 'undefined', 'typeof(RegExp.prototype.lastIndex)');
diff --git a/test/built-ins/RegExp/prototype/lastIndex/15.10.7.5-2.js b/test/built-ins/RegExp/prototype/lastIndex/15.10.7.5-2.js
deleted file mode 100644
index a9a7e73c84f2a5fb796e6de78e43cb9044e6227b..0000000000000000000000000000000000000000
--- a/test/built-ins/RegExp/prototype/lastIndex/15.10.7.5-2.js
+++ /dev/null
@@ -1,11 +0,0 @@
-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-es5id: 15.10.7.5-2
-description: RegExp.prototype.lastIndex is not present
----*/
-
-  var d = Object.getOwnPropertyDescriptor(RegExp.prototype, 'lastIndex');
-
-assert.sameValue(d, undefined, 'd');