--- a/netwerk/test/TestNamedPipeService.cpp
+++ b/netwerk/test/TestNamedPipeService.cpp
@@ -1,17 +1,17 @@
 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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/. */
 
 #include "TestCommon.h"
 #include "gtest/gtest.h"
 
-#include <Windows.h>
+#include <windows.h>
 
 #include "mozilla/Atomics.h"
 #include "mozilla/Monitor.h"
 #include "nsINamedPipeService.h"
 #include "nsNetCID.h"
 
 #define PIPE_NAME "\\\\.\\pipe\\TestNPS"
 #define TEST_STR "Hello World"