--- a/dom/canvas/WebGLExtensionElementIndexUint.cpp
+++ b/dom/canvas/WebGLExtensionElementIndexUint.cpp
@@ -1,15 +1,16 @@
 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
 /* 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/. */
 
 #include "WebGLExtensions.h"
 
+#include "GLContext.h"
 #include "mozilla/dom/WebGLRenderingContextBinding.h"
 #include "WebGLContext.h"
 
 namespace mozilla {
 
 /*static*/ bool
 WebGLExtensionElementIndexUint::IsSupported(const WebGLContext* webgl)
 {