diff --git a/openerp/addons/base/ir/ir_rule.py b/openerp/addons/base/ir/ir_rule.py
index fbb6e250d56..ecf381bc0a5 100644
--- a/openerp/addons/base/ir/ir_rule.py
+++ b/openerp/addons/base/ir/ir_rule.py
@@ -111,9 +111,8 @@ class ir_rule(osv.osv):
                 # read 'domain' as UID to have the correct eval context for the rule.
                 rule_domain = self.read(cr, uid, [rule.id], ['domain'])[0]['domain']
                 dom = expression.normalize_domain(rule_domain)
-                for group in rule.groups:
-                    if group in user.groups_id:
-                        group_domains.setdefault(group, []).append(dom)
+                if rule.groups & user.groups_id:
+                    group_domains.setdefault(rule.groups[0], []).append(dom)
                 if not rule.groups:
                     global_domains.append(dom)
             # combine global domains and group domains