diff --git a/bin/addons/base/res/res_widget.py b/bin/addons/base/res/res_widget.py
index 0883989ffa3..608c9c6d773 100644
--- a/bin/addons/base/res/res_widget.py
+++ b/bin/addons/base/res/res_widget.py
@@ -39,7 +39,7 @@ class res_widget_user(osv.osv):
     _columns = {
         'sequence': fields.integer('Sequence'),
         'user_id': fields.many2one('res.users','User', select=1),
-        'widget_id': fields.many2one('res.widget','Widget',required=True),
+        'widget_id': fields.many2one('res.widget','Widget',required=True, ondelete='cascade'),
     }
 
     def create(self, cr, uid, vals, context=None):