diff --git a/paddle/fluid/framework/trainer_desc.proto b/paddle/fluid/framework/trainer_desc.proto
index 896e9ae99a02f82304906e9ce9a254bbe0bc9687..6dbce6a02ca1c037e4d5f54e7a6d2462cc68578b 100644
--- a/paddle/fluid/framework/trainer_desc.proto
+++ b/paddle/fluid/framework/trainer_desc.proto
@@ -46,8 +46,8 @@ message DownpourWorkerParameter {
   repeated TableParameter dense_table = 2;
   repeated string skip_ops = 3;
   repeated ProgramConfig program_config = 4;
-  bool push_sparse = 5 [ default = true ];
-  bool push_dense = 6 [ default = true ];
+  optional bool push_sparse = 5 [ default = true ];
+  optional bool push_dense = 6 [ default = true ];
 }
 
 message FetchConfig {