diff --git a/addons/portal/portal.py b/addons/portal/portal.py
index 1e8f59c3d42..13f7ce8ca57 100644
--- a/addons/portal/portal.py
+++ b/addons/portal/portal.py
@@ -212,7 +212,7 @@ class portal_widget(osv.osv):
     _order = 'sequence'
     _columns = {
         'sequence': fields.integer('Sequence'),
-        'portal_id': fields.many2one('res.portal', select=1,
+        'portal_id': fields.many2one('res.portal', select=1, ondelete='cascade',
             string='Portal'),
         'widget_id': fields.many2one('res.widget', required=True, ondelete='cascade',
             string='Widget'),