diff --git a/benchmark/grpc_testing/test.pb.go b/benchmark/grpc_testing/test.pb.go
index 619c450ca..5561c2318 100644
--- a/benchmark/grpc_testing/test.pb.go
+++ b/benchmark/grpc_testing/test.pb.go
@@ -419,9 +419,10 @@ func RegisterTestServiceServer(s *grpc.Server, srv TestServiceServer) {
 	s.RegisterService(&_TestService_serviceDesc, srv)
 }
 
-func _TestService_UnaryCall_Handler(srv interface{}, ctx context.Context, codec grpc.Codec, buf []byte) (interface{}, error) {
+func _TestService_UnaryCall_Handler(srv interface{}, ctx context.Context, decodeFunc func([]byte, interface{}) error, buf []byte) (interface{}, error) {
 	in := new(SimpleRequest)
-	if err := codec.Unmarshal(buf, in); err != nil {
+	//if err := codec.Unmarshal(buf, in); err != nil {
+	if err := decodeFunc(buf, in); err != nil {
 		return nil, err
 	}
 	out, err := srv.(TestServiceServer).UnaryCall(ctx, in)