diff --git a/paddle/fluid/operators/dropout_op.cc b/paddle/fluid/operators/dropout_op.cc
index 856bed8ac7e0ae75dcb87f6857e7997c1b04878f..cbfb795d6a23e1837b2a4095a4480c979e6b6d3b 100644
--- a/paddle/fluid/operators/dropout_op.cc
+++ b/paddle/fluid/operators/dropout_op.cc
@@ -88,8 +88,8 @@ class DropoutOpMaker : public framework::OpProtoAndCheckerMaker {
                   "training. Setting this flag to true is only useful in "
                   "unittest or for debug that always the same output units "
                   "will be dropped.")
-        .SetDefault(false);
-
+        .SetDefault(false)
+        .AsExtra();
     AddAttr<int>("seed", "Dropout random seed.").SetDefault(0).AsExtra();
     AddAttr<std::string>(
         "dropout_implementation",