diff --git a/dygraph/resnet/train.py b/dygraph/resnet/train.py
index d768f920621c7168419fa27024e6f6d8cf21d65e..5817200dcdb2ec0acf04ba5060b225c38e88fc86 100644
--- a/dygraph/resnet/train.py
+++ b/dygraph/resnet/train.py
@@ -88,7 +88,7 @@ class ConvBNLayer(fluid.dygraph.Layer):
             padding=(filter_size - 1) // 2,
             groups=groups,
             act=None,
-            bias_attr=None)
+            bias_attr=False)
 
         self._batch_norm = BatchNorm(self.full_name(), num_filters, act=act)