1 files changed, 4 insertions, 0 deletions
diff --git a/test/cpp/interop/interop_server.cc b/test/cpp/interop/interop_server.cc
index 7e40bcf40a..b1c43cd017 100644
--- a/test/cpp/interop/interop_server.cc
+++ b/test/cpp/interop/interop_server.cc
@@ -56,6 +56,7 @@
 
 DEFINE_bool(use_tls, false, "Whether to use tls.");
 DEFINE_int32(port, 0, "Server port.");
+DEFINE_int32(max_send_message_size, -1, "The maximum send message size.");
 
 using grpc::Server;
 using grpc::ServerBuilder;
@@ -326,6 +327,9 @@ void grpc::testing::interop::RunServer(
   ServerBuilder builder;
   builder.RegisterService(&service);
   builder.AddListeningPort(server_address.str(), creds);
+  if (FLAGS_max_send_message_size >= 0) {
+    builder.SetMaxSendMessageSize(FLAGS_max_send_message_size);
+  }
   std::unique_ptr<Server> server(builder.BuildAndStart());
   gpr_log(GPR_INFO, "Server listening on %s", server_address.str().c_str());
   while (!g_got_sigint) {