--- a/plcopen/structures.py	Fri Oct 12 11:50:40 2018 +0300
+++ b/plcopen/structures.py	Fri Oct 12 12:06:45 2018 +0300
@@ -26,6 +26,7 @@
 from __future__ import absolute_import
 import re
 from collections import OrderedDict
+from functools import reduce
 
 from plcopen.plcopen import LoadProject
 from plcopen.definitions import *