diff --git a/certificate_checker_mock.h b/certificate_checker_mock.h
index 78c44b7..f00dc85 100644
--- a/certificate_checker_mock.h
+++ b/certificate_checker_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_CERTIFICATE_CHECKER_MOCK_H_
-#define CHROMEOS_PLATFORM_UPDATE_ENGINE_CERTIFICATE_CHECKER_MOCK_H_
+#ifndef UPDATE_ENGINE_CERTIFICATE_CHECKER_MOCK_H_
+#define UPDATE_ENGINE_CERTIFICATE_CHECKER_MOCK_H_
 
 #include <gmock/gmock.h>
 #include <openssl/ssl.h>
@@ -23,4 +23,4 @@
 
 }  // namespace chromeos_update_engine
 
-#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_CERTIFICATE_CHECKER_MOCK_H_
+#endif  // UPDATE_ENGINE_CERTIFICATE_CHECKER_MOCK_H_