diff --git a/openerp/addons/base/ir/ir_ui_view.py b/openerp/addons/base/ir/ir_ui_view.py
index ee23a2f52f1..56f7ae76519 100644
--- a/openerp/addons/base/ir/ir_ui_view.py
+++ b/openerp/addons/base/ir/ir_ui_view.py
@@ -47,8 +47,8 @@ class view_custom(osv.osv):
     _name = 'ir.ui.view.custom'
     _order = 'create_date desc'  # search(limit=1) should return the last customization
     _columns = {
-        'ref_id': fields.many2one('ir.ui.view', 'Original View', select=True),
-        'user_id': fields.many2one('res.users', 'User', select=True),
+        'ref_id': fields.many2one('ir.ui.view', 'Original View', select=True, required=True, ondelete='cascade'),
+        'user_id': fields.many2one('res.users', 'User', select=True, required=True, ondelete='cascade'),
         'arch': fields.text('View Architecture', required=True),
     }