diff --git a/deps/oblib/src/rpc/obrpc/ob_rpc_session_handler.cpp b/deps/oblib/src/rpc/obrpc/ob_rpc_session_handler.cpp
index 1c8462a0d..52b2471f8 100644
--- a/deps/oblib/src/rpc/obrpc/ob_rpc_session_handler.cpp
+++ b/deps/oblib/src/rpc/obrpc/ob_rpc_session_handler.cpp
@@ -198,7 +198,7 @@ int ObRpcSessionHandler::wait_for_next_request(int64_t sessid,
         LOG_WARN("session wait thread id doesn't equal each other",
                  K(ret), K(sessid), K(thid), K(wait_object.thid_), K(ret));
       } else if (NULL == wait_object.req_) {
-        int32_t timeout_ms = static_cast<int32_t>(timeout / 1000);
+        int64_t timeout_ms = timeout / 1000;
         if (timeout_ms < DEFAULT_WAIT_TIMEOUT_MS) {
           timeout_ms = DEFAULT_WAIT_TIMEOUT_MS;
         } else {