diff --git a/addons/mass_mailing/models/mailing_trace.py b/addons/mass_mailing/models/mailing_trace.py
index 38185845545..ef3c51f0141 100644
--- a/addons/mass_mailing/models/mailing_trace.py
+++ b/addons/mass_mailing/models/mailing_trace.py
@@ -31,7 +31,7 @@ class MailingTrace(models.Model):
     model = fields.Char(string='Document model')
     res_id = fields.Integer(string='Document ID')
     # campaign / wave data
-    mass_mailing_id = fields.Many2one('mailing.mailing', string='Mailing', index=True)
+    mass_mailing_id = fields.Many2one('mailing.mailing', string='Mailing', index=True, ondelete='cascade')
     campaign_id = fields.Many2one(
         related='mass_mailing_id.campaign_id',
         string='Campaign',