diff --git a/pyretic/core/runtime.py b/pyretic/core/runtime.py
index a6b42308..30a2b5aa 100644
--- a/pyretic/core/runtime.py
+++ b/pyretic/core/runtime.py
@@ -1030,7 +1030,7 @@ def install_diff_lists(diff_lists, classifier_version_no):
 
             if to_delete:
                 for rule in to_delete:
-                    (match_dict,priority,_,_) = rule
+                    (match_dict,priority,_,_,_) = rule
                     if match_dict['switch'] in switches:
                         self.delete_rule((match_dict, priority))
             if to_add: