diff --git a/addons/website_event/models/event.py b/addons/website_event/models/event.py
index 8fab469c5c8..927ede499be 100644
--- a/addons/website_event/models/event.py
+++ b/addons/website_event/models/event.py
@@ -33,7 +33,7 @@ class Event(models.Model):
         'Dedicated Menu', compute='_compute_website_menu', inverse='_set_website_menu',
         help="Creates menus Introduction, Location and Register on the page "
              " of the event on the website.", store=True)
-    menu_id = fields.Many2one('website.menu', 'Event Menu')
+    menu_id = fields.Many2one('website.menu', 'Event Menu', copy=False)
 
     def _compute_is_participating(self):
         # we don't allow public user to see participating label