diff --git a/trytond/ir/rule.py b/trytond/ir/rule.py
index 714c5aead4..91c7df35bc 100644
--- a/trytond/ir/rule.py
+++ b/trytond/ir/rule.py
@@ -221,7 +221,7 @@ class Rule(ModelSQL, ModelView):
 
             if no_rules:
                 group_id = no_rules[0]
-                clause[cls(group_id)] = []
+                clause[RuleGroup(group_id)] = []
 
         return clause, clause_global