diff --git a/addons/mass_mailing/models/mass_mailing.py b/addons/mass_mailing/models/mass_mailing.py
index a47e2840470..76b02e71226 100644
--- a/addons/mass_mailing/models/mass_mailing.py
+++ b/addons/mass_mailing/models/mass_mailing.py
@@ -650,7 +650,7 @@ class MassMailing(models.Model):
 
     @api.multi
     def cancel_mass_mailing(self):
-        self.write({'state': 'draft'})
+        self.write({'state': 'draft', 'schedule_date': False})
 
     @api.multi
     def retry_failed_mail(self):