diff --git a/addons/website_event/models/event.py b/addons/website_event/models/event.py
index 3b5c93f47e7..728f8e0a568 100644
--- a/addons/website_event/models/event.py
+++ b/addons/website_event/models/event.py
@@ -36,7 +36,7 @@ class event(models.Model):
     show_menu = fields.Boolean('Dedicated Menu', compute='_get_show_menu', inverse='_set_show_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)
 
     @api.one
     def _get_new_menu_pages(self):