diff --git a/xpcom/base/AvailableMemoryTracker.cpp b/xpcom/base/AvailableMemoryTracker.cpp
index 66c84c46c47..261041bb517 100644
--- a/xpcom/base/AvailableMemoryTracker.cpp
+++ b/xpcom/base/AvailableMemoryTracker.cpp
@@ -1,7 +1,7 @@
 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim:set ts=2 sw=2 sts=2 ci et: */
 /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
@@ -15,14 +15,26 @@
  *
  * The Original Code is Mozilla.org code.
  *
- * The Initial Developer of the Original Code is
- * the Mozilla Foundation.
+ * The Initial Developer of the Original Code is the Mozilla Foundation.
+ * 
  * Portions created by the Initial Developer are Copyright (C) 2011
  * the Initial Developer. All Rights Reserved.
  *
  * Contributor(s):
  *   Justin Lebar <justin.lebar@gmail.com>
  *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
  * ***** END LICENSE BLOCK ***** */
 
 #include "mozilla/AvailableMemoryTracker.h"
diff --git a/xpcom/base/AvailableMemoryTracker.h b/xpcom/base/AvailableMemoryTracker.h
index 05f5bb6c943..111cb725771 100644
--- a/xpcom/base/AvailableMemoryTracker.h
+++ b/xpcom/base/AvailableMemoryTracker.h
@@ -1,7 +1,7 @@
 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim:set ts=2 sw=2 sts=2 ci et: */
 /* ***** BEGIN LICENSE BLOCK *****
- * Version: MPL 1.1
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
  *
  * The contents of this file are subject to the Mozilla Public License Version
  * 1.1 (the "License"); you may not use this file except in compliance with
@@ -15,14 +15,26 @@
  *
  * The Original Code is Mozilla.org code.
  *
- * The Initial Developer of the Original Code is
- * the Mozilla Foundation.
+ * The Initial Developer of the Original Code is the Mozilla Foundation.
+ * 
  * Portions created by the Initial Developer are Copyright (C) 2011
  * the Initial Developer. All Rights Reserved.
  *
  * Contributor(s):
  *   Justin Lebar <justin.lebar@gmail.com>
  *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
  * ***** END LICENSE BLOCK ***** */
 
 #ifndef mozilla_AvailableMemoryTracker_h