diff --git a/paddle/operators/detail/grpc_client.cc b/paddle/operators/detail/grpc_client.cc
index d699dabf2fb982f267c4869180efaf0e600eb46c..90e2b29659b494493487b7a55532d580c2ad7387 100644
--- a/paddle/operators/detail/grpc_client.cc
+++ b/paddle/operators/detail/grpc_client.cc
@@ -102,7 +102,7 @@ bool RPCClient::Wait() {
     return true;
   }
 
-  std::vector<bool> a(req_count_);
+  bool a[req_count_];
   std::vector<std::future<void>> waits(req_count_);
 
   for (int i = 0; i < req_count_; i++) {