diff --git a/test/cpp/util/grpc_tool.cc b/test/cpp/util/grpc_tool.cc
index 856cd32c3ce0f8fed980137132167615239ba59a..c7acb7c63135c5fd3c9d36bb01020d1148295983 100644
--- a/test/cpp/util/grpc_tool.cc
+++ b/test/cpp/util/grpc_tool.cc
@@ -321,6 +321,7 @@ bool GrpcTool::ListServices(int argc, const char** argv,
 
   std::vector<grpc::string> service_list;
   if (!desc_db.GetServices(&service_list)) {
+    fprintf(stderr, "Received an error when querying services endpoint.\n");
     return false;
   }