diff --git a/mock_payload_state.h b/mock_payload_state.h
index 4e21a0f..8301adb 100644
--- a/mock_payload_state.h
+++ b/mock_payload_state.h
@@ -2,8 +2,8 @@
 // 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_MOCK_PAYLOAD_STATE_H__
-#define CHROMEOS_PLATFORM_UPDATE_ENGINE_MOCK_PAYLOAD_STATE_H__
+#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_MOCK_PAYLOAD_STATE_H_
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_MOCK_PAYLOAD_STATE_H_
 
 #include "gmock/gmock.h"
 #include "update_engine/omaha_request_action.h"
@@ -57,4 +57,4 @@
 
 }  // namespace chromeos_update_engine
 
-#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_MOCK_PAYLOAD_STATE_H__
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_MOCK_PAYLOAD_STATE_H_