diff --git a/base/third_party/cityhash_v103/src/city_v103.h b/base/third_party/cityhash_v103/src/city_v103.h
index c2ab352cb56c..398de9b6e303 100644
--- a/base/third_party/cityhash_v103/src/city_v103.h
+++ b/base/third_party/cityhash_v103/src/city_v103.h
@@ -40,8 +40,8 @@
 // of a+b is easily derived from the hashes of a and b.  This property
 // doesn't hold for any hash functions in this file.
 
-#ifndef CITY_HASH_H_
-#define CITY_HASH_H_
+#ifndef BASE_THIRD_PARTY_CITYHASH_V103_SRC_CITY_V103_H_
+#define BASE_THIRD_PARTY_CITYHASH_V103_SRC_CITY_V103_H_
 
 #include <stdlib.h>  // for size_t.
 #include <stdint.h>
@@ -87,4 +87,4 @@ inline uint64 Hash128to64(const uint128& x) {
   return b;
 }
 
-#endif  // CITY_HASH_H_
+#endif  // BASE_THIRD_PARTY_CITYHASH_V103_SRC_CITY_V103_H_