diff --git a/src/brpc/rpc_pb_message_factory.h b/src/brpc/rpc_pb_message_factory.h
index 52787be1e4..e65c8f144a 100644
--- a/src/brpc/rpc_pb_message_factory.h
+++ b/src/brpc/rpc_pb_message_factory.h
@@ -113,6 +113,7 @@ class ArenaRpcPBMessageFactory : public RpcPBMessageFactory {
         auto arena_messages = static_cast<ArenaRpcPBMessages*>(messages);
         arena_messages->request = NULL;
         arena_messages->response = NULL;
+        arena_messages->arena.Reset();
         butil::return_object(arena_messages);
     }