diff --git a/trytond/ir/ui/menu.py b/trytond/ir/ui/menu.py
index 2c9b7d9a19..78fcb74f6a 100644
--- a/trytond/ir/ui/menu.py
+++ b/trytond/ir/ui/menu.py
@@ -81,7 +81,7 @@ class UIMenu(OSV):
     childs = fields.One2Many('ir.ui.menu', 'parent','Childs')
     parent = fields.Many2One('ir.ui.menu', 'Parent Menu', select=1)
     groups = fields.Many2Many('res.group', 'ir_ui_menu_group_rel',
-       'menu_id', 'gid', 'Groups')
+       'menu_id', 'gid', 'Groups', ondelete_target='CASCADE')
     complete_name = fields.Function('get_full_name',
        string='Complete Name', type='char', order_field='name')
     icon = fields.Selection(ICONS, 'Icon')