diff --git a/python/paddle/v2/fluid/layers.py b/python/paddle/v2/fluid/layers.py
index 1789d2f82a8813331b3610fc69f8447925cd7501..02ad2ecd72193a2bd23e47f012aba981aaa9dc2a 100644
--- a/python/paddle/v2/fluid/layers.py
+++ b/python/paddle/v2/fluid/layers.py
@@ -661,7 +661,7 @@ def conv2d(input,
     if groups is None:
         num_filter_channels = num_channels
     else:
-        if num_channels % groups is not 0:
+        if num_channels % groups != 0:
             raise ValueError("num_channels must be divisible by groups.")
         num_filter_channels = num_channels / groups