diff --git a/addons/calendar/calendar.py b/addons/calendar/calendar.py
index 1beca121120..d1aa4674029 100644
--- a/addons/calendar/calendar.py
+++ b/addons/calendar/calendar.py
@@ -95,7 +95,7 @@ class calendar_attendee(osv.Model):
         'email': fields.char('Email', help="Email of Invited Person"),
         'availability': fields.selection([('free', 'Free'), ('busy', 'Busy')], 'Free/Busy', readonly="True"),
         'access_token': fields.char('Invitation Token'),
-        'event_id': fields.many2one('calendar.event', 'Meeting linked'),
+        'event_id': fields.many2one('calendar.event', 'Meeting linked', ondelete='cascade'),
     }
     _defaults = {
         'state': 'needsAction',