diff --git a/graph_utils.h b/graph_utils.h
index 6f7b9a2..30b9c0b 100644
--- a/graph_utils.h
+++ b/graph_utils.h
@@ -1,9 +1,9 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_GRAPH_UTILS_H__
-#define CHROMEOS_PLATFORM_UPDATE_ENGINE_GRAPH_UTILS_H__
+#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_GRAPH_UTILS_H_
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_GRAPH_UTILS_H_
 
 #include <vector>
 #include "base/basictypes.h"
@@ -60,4 +60,4 @@
 
 }  // namespace chromeos_update_engine
 
-#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_GRAPH_UTILS_H__
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_GRAPH_UTILS_H_