diff --git a/python/paddle/fluid/layers/nn.py b/python/paddle/fluid/layers/nn.py
index 46ce58fd2db19205e4d1194c30cba76a83fa2de8..586eac7fd686833c29500708e3225f80f072efc1 100644
--- a/python/paddle/fluid/layers/nn.py
+++ b/python/paddle/fluid/layers/nn.py
@@ -3236,7 +3236,7 @@ def group_norm(input,
     # create output
     mean_out = helper.create_variable(dtype=dtype, stop_gradient=True)
     variance_out = helper.create_variable(dtype=dtype, stop_gradient=True)
-    group_norm_out = helper.create_variable(dtype)
+    group_norm_out = helper.create_variable(dtype=dtype)
 
     helper.append_op(
         type="group_norm",