--- a/server/migractions.py	Tue Sep 15 16:15:03 2015 +0200
+++ b/server/migractions.py	Tue Oct 13 15:09:22 2015 +0200
@@ -420,7 +420,7 @@
                                      {'x': expreid}, ask_confirm=False)
                 else:
                     newexprs.pop(expression)
-            for expression in newexprs.itervalues():
+            for expression in newexprs.values():
                 expr = expression.expression
                 if not confirm or self.confirm('Add %s expression for %s permission of %s?'
                                                % (expr, action, erschema)):