diff --git a/policy_manager/state.h b/policy_manager/state.h
index 412925d..4950b56 100644
--- a/policy_manager/state.h
+++ b/policy_manager/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_POLICY_MANAGER_STATE_H
-#define CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_STATE_H
+#ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_STATE_H_
+#define CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_STATE_H_
 
 #include "update_engine/policy_manager/random_provider.h"
 #include "update_engine/policy_manager/shill_provider.h"
@@ -45,4 +45,4 @@
 
 }  // namespace chromeos_policy_manager
 
-#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_STATE_H
+#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_POLICY_MANAGER_STATE_H_