Guard headers tool.
diff --git a/src/compiler/generator_helpers.h b/src/compiler/generator_helpers.h
index 0c14bb8..2035820 100644
--- a/src/compiler/generator_helpers.h
+++ b/src/compiler/generator_helpers.h
@@ -31,8 +31,8 @@
  *
  */
 
-#ifndef NET_GRPC_COMPILER_GENERATOR_HELPERS_H__
-#define NET_GRPC_COMPILER_GENERATOR_HELPERS_H__
+#ifndef GRPC_INTERNAL_COMPILER_GENERATOR_HELPERS_H
+#define GRPC_INTERNAL_COMPILER_GENERATOR_HELPERS_H
 
 #include <map>
 #include <string>
@@ -76,4 +76,4 @@
 
 }  // namespace grpc_generator
 
-#endif  // NET_GRPC_COMPILER_GENERATOR_HELPERS_H__
+#endif  // GRPC_INTERNAL_COMPILER_GENERATOR_HELPERS_H