diff --git a/prefs_mock.h b/prefs_mock.h
index 36efd40..9ba4a52 100644
--- a/prefs_mock.h
+++ b/prefs_mock.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_PREFS_MOCK_H_
-#define CHROMEOS_PLATFORM_UPDATE_ENGINE_PREFS_MOCK_H_
+#ifndef UPDATE_ENGINE_PREFS_MOCK_H_
+#define UPDATE_ENGINE_PREFS_MOCK_H_
 
 #include <string>
 
@@ -30,4 +30,4 @@
 
 }  // namespace chromeos_update_engine
 
-#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_PREFS_MOCK_H_
+#endif  // UPDATE_ENGINE_PREFS_MOCK_H_