diff --git a/macros/read_group_macros.xml b/macros/read_group_macros.xml
index 8931011709e..2a0a7c97b57 100644
--- a/macros/read_group_macros.xml
+++ b/macros/read_group_macros.xml
@@ -23,7 +23,7 @@
         #import itertools
         #set $input_name1 = $clean($identifier_or_name($input1))
         #set $input_name2 = $clean($identifier_or_name($input2))
-        #set $common_prefix = ''.join([c[0] for c in itertools.takewhile(lambda x: all(x[0] == y for y in x), itertools.izip(*[$input_name1, $input_name2]))])
+        #set $common_prefix = ''.join([c[0] for c in itertools.takewhile(lambda x: all(x[0] == y for y in x), zip(*[$input_name1, $input_name2]))])
         #if len($common_prefix) > 3
             #return $common_prefix
         #else