diff --git a/include/grpc++/impl/codegen/metadata_map.h b/include/grpc++/impl/codegen/metadata_map.h
index fc2ed7d9e1a811c06ef1d62d3667a19ca9726dc3..53b9d62f9f9f5816acd23b9c2fd18d611d2d6c61 100644
--- a/include/grpc++/impl/codegen/metadata_map.h
+++ b/include/grpc++/impl/codegen/metadata_map.h
@@ -31,8 +31,8 @@
 *
 */
 
-#ifndef META_H
-#define META_H
+#ifndef GRPCXX_IMPL_CODEGEN_METADATA_MAP_H
+#define GRPCXX_IMPL_CODEGEN_METADATA_MAP_H
 
 #include <grpc++/impl/codegen/slice.h>
 
@@ -68,4 +68,4 @@ class MetadataMap {
 
 }  // namespace grpc
 
-#endif
+#endif  // GRPCXX_IMPL_CODEGEN_METADATA_MAP_H