diff --git a/scripts/koji-group-sync.py b/scripts/koji-group-sync.py
index 6e6857a..334fe9f 100644
--- a/scripts/koji-group-sync.py
+++ b/scripts/koji-group-sync.py
@@ -26,7 +26,7 @@ def write_file(group_membership, filename=GROUP_FILE):
     with open(filename, 'w') as groupfile:
         for groupname, users in group_membership.iteritems():
             signame = groupname[len(GROUP_INCLUDE_PREFIX):]
-            print >>groupfile, "{}:{}".format(signame, ','.join(users))
+            print >>groupfile, "{0}:{1}".format(signame, ','.join(users))
 
 
 if __name__ == '__main__':