diff --git a/utils/conv_gen.py b/utils/conv_gen.py
index 78b2335..62fa8ad 100644
--- a/utils/conv_gen.py
+++ b/utils/conv_gen.py
@@ -24,6 +24,7 @@
 """
 
 import sys, os, math
+from functools import reduce
 
 class ConvolutionalCode(object):