diff --git a/include/grpcpp/impl/codegen/byte_buffer.h b/include/grpcpp/impl/codegen/byte_buffer.h
index 4347745c2d7..2c015f2266f 100644
--- a/include/grpcpp/impl/codegen/byte_buffer.h
+++ b/include/grpcpp/impl/codegen/byte_buffer.h
@@ -41,8 +41,7 @@ class CallbackUnaryHandler;
 template <class RequestType, class ResponseType>
 class CallbackServerStreamingHandler;
 template <class RequestType>
-void* UnaryDeserializeHelper(grpc_call*, grpc_byte_buffer*, ::grpc::Status*,
-                             RequestType*);
+void* UnaryDeserializeHelper(grpc_byte_buffer*, ::grpc::Status*, RequestType*);
 template <class ServiceType, class RequestType, class ResponseType>
 class ServerStreamingHandler;
 template <::grpc::StatusCode code>
@@ -164,7 +163,7 @@ class ByteBuffer final {
   friend class internal::CallOpRecvMessage;
   friend class internal::CallOpGenericRecvMessage;
   template <class RequestType>
-  friend void* internal::UnaryDeserializeHelper(grpc_call*, grpc_byte_buffer*,
+  friend void* internal::UnaryDeserializeHelper(grpc_byte_buffer*,
                                                 ::grpc::Status*, RequestType*);
   template <class ServiceType, class RequestType, class ResponseType>
   friend class internal::ServerStreamingHandler;
diff --git a/include/grpcpp/impl/codegen/method_handler.h b/include/grpcpp/impl/codegen/method_handler.h
index 963423df467..756f4aae751 100644
--- a/include/grpcpp/impl/codegen/method_handler.h
+++ b/include/grpcpp/impl/codegen/method_handler.h
@@ -77,8 +77,8 @@ void UnaryRunHandlerHelper(const MethodHandler::HandlerParameter& param,
 /// A helper function with reduced templating to do deserializing.
 
 template <class RequestType>
-void* UnaryDeserializeHelper(grpc_call* call, grpc_byte_buffer* req,
-                             ::grpc::Status* status, RequestType* request) {
+void* UnaryDeserializeHelper(grpc_byte_buffer* req, ::grpc::Status* status,
+                             RequestType* request) {
   ::grpc::ByteBuffer buf;
   buf.set_buffer(req);
   *status = ::grpc::SerializationTraits<RequestType>::Deserialize(
@@ -123,7 +123,7 @@ class RpcMethodHandler : public ::grpc::internal::MethodHandler {
     auto* request =
         new (::grpc::g_core_codegen_interface->grpc_call_arena_alloc(
             call, sizeof(RequestType))) RequestType;
-    return UnaryDeserializeHelper(call, req, status,
+    return UnaryDeserializeHelper(req, status,
                                   static_cast<BaseRequestType*>(request));
   }