diff --git a/src/compiler/config.h b/src/compiler/config.h
index 49c78755b50..91f4b4d7826 100644
--- a/src/compiler/config.h
+++ b/src/compiler/config.h
@@ -40,8 +40,7 @@ namespace protobuf {
 namespace compiler {
 typedef GRPC_CUSTOM_CODEGENERATOR CodeGenerator;
 typedef GRPC_CUSTOM_GENERATORCONTEXT GeneratorContext;
-static inline int PluginMain(int argc, char* argv[],
-                             const CodeGenerator* generator) {
+static inline int PluginMain(int argc, char* argv[], CodeGenerator* generator) {
   return GRPC_CUSTOM_PLUGINMAIN(argc, argv, generator);
 }
 static inline void ParseGeneratorParameter(