diff --git a/include/grpcpp/impl/codegen/message_allocator.h b/include/grpcpp/impl/codegen/message_allocator.h
index 53ea05efe8e..107bec62f1d 100644
--- a/include/grpcpp/impl/codegen/message_allocator.h
+++ b/include/grpcpp/impl/codegen/message_allocator.h
@@ -26,11 +26,11 @@ namespace experimental {
 // call arena in here in the future.
 template <typename RequestT, typename ResponseT>
 struct RpcAllocatorInfo {
-  RequestT* request = nullptr;
-  ResponseT* response = nullptr;
+  RequestT* request;
+  ResponseT* response;
   // per rpc allocator internal state. MessageAllocator can set it when
   // AllocateMessages is called and use it later.
-  void* allocator_state = nullptr;
+  void* allocator_state;
 };
 
 // Implementations need to be thread-safe
diff --git a/src/compiler/cpp_generator.cc b/src/compiler/cpp_generator.cc
index da95ee7ffe2..25c1639b6e2 100644
--- a/src/compiler/cpp_generator.cc
+++ b/src/compiler/cpp_generator.cc
@@ -1002,7 +1002,7 @@ void PrintHeaderServerMethodCallback(
                    "void SetMessageAllocatorFor_$Method$(\n"
                    "    ::grpc::experimental::MessageAllocator< "
                    "$RealRequest$, $RealResponse$>* allocator) {\n"
-                   "  dynamic_cast<::grpc::internal::CallbackUnaryHandler< "
+                   "  static_cast<::grpc::internal::CallbackUnaryHandler< "
                    "$RealRequest$, $RealResponse$>*>(\n"
                    "      ::grpc::Service::experimental().GetHandler($Idx$))\n"
                    "          ->SetMessageAllocator(allocator);\n");
diff --git a/test/cpp/codegen/compiler_test_golden b/test/cpp/codegen/compiler_test_golden
index 91335bf2c0c..9f59bb5d706 100644
--- a/test/cpp/codegen/compiler_test_golden
+++ b/test/cpp/codegen/compiler_test_golden
@@ -338,7 +338,7 @@ class ServiceA final {
     }
     void SetMessageAllocatorFor_MethodA1(
         ::grpc::experimental::MessageAllocator< ::grpc::testing::Request, ::grpc::testing::Response>* allocator) {
-      dynamic_cast<::grpc::internal::CallbackUnaryHandler< ::grpc::testing::Request, ::grpc::testing::Response>*>(
+      static_cast<::grpc::internal::CallbackUnaryHandler< ::grpc::testing::Request, ::grpc::testing::Response>*>(
           ::grpc::Service::experimental().GetHandler(0))
               ->SetMessageAllocator(allocator);
     }
@@ -812,7 +812,7 @@ class ServiceB final {
     }
     void SetMessageAllocatorFor_MethodB1(
         ::grpc::experimental::MessageAllocator< ::grpc::testing::Request, ::grpc::testing::Response>* allocator) {
-      dynamic_cast<::grpc::internal::CallbackUnaryHandler< ::grpc::testing::Request, ::grpc::testing::Response>*>(
+      static_cast<::grpc::internal::CallbackUnaryHandler< ::grpc::testing::Request, ::grpc::testing::Response>*>(
           ::grpc::Service::experimental().GetHandler(0))
               ->SetMessageAllocator(allocator);
     }