diff --git a/bin/addons/base/ir/ir_model.py b/bin/addons/base/ir/ir_model.py
index 38ac5428bcb..fedbf5e8cad 100644
--- a/bin/addons/base/ir/ir_model.py
+++ b/bin/addons/base/ir/ir_model.py
@@ -379,7 +379,7 @@ class ir_model_access(osv.osv):
     _name = 'ir.model.access'
     _columns = {
         'name': fields.char('Name', size=64, required=True, select=True),
-        'model_id': fields.many2one('ir.model', 'Object', required=True, domain=[('osv_memory','=', False)], select=True),
+        'model_id': fields.many2one('ir.model', 'Object', required=True, domain=[('osv_memory','=', False)], select=True, ondelete='cascade'),
         'group_id': fields.many2one('res.groups', 'Group', ondelete='cascade', select=True),
         'perm_read': fields.boolean('Read Access'),
         'perm_write': fields.boolean('Write Access'),