--- a/plcopen/structures.py	Tue Oct 03 16:31:31 2017 +0300
+++ b/plcopen/structures.py	Thu Oct 05 16:38:49 2017 +0300
@@ -51,7 +51,7 @@
     """
     Returns list of all types that correspont to the ANY* meta type
     """
-    return [typename for typename, parenttype in TypeHierarchy.items() if not typename.startswith("ANY") and IsOfType(typename, type)]
+    return [typename for typename, _parenttype in TypeHierarchy.items() if not typename.startswith("ANY") and IsOfType(typename, type)]
 
 
 DataTypeRange = dict(DataTypeRange_list)