diff --git a/proxy_resolver.h b/proxy_resolver.h
index 98cb53b..03bf731 100644
--- a/proxy_resolver.h
+++ b/proxy_resolver.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_PROXY_RESOLVER_H_
-#define CHROMEOS_PLATFORM_UPDATE_ENGINE_PROXY_RESOLVER_H_
+#ifndef UPDATE_ENGINE_PROXY_RESOLVER_H_
+#define UPDATE_ENGINE_PROXY_RESOLVER_H_
 
 
 #include <deque>
@@ -73,4 +73,4 @@
 
 }  // namespace chromeos_update_engine
 
-#endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_PROXY_RESOLVER_H_
+#endif  // UPDATE_ENGINE_PROXY_RESOLVER_H_