diff --git a/addons/mail/models/mail_thread.py b/addons/mail/models/mail_thread.py
index 1edbd7f6275..9589bab1278 100644
--- a/addons/mail/models/mail_thread.py
+++ b/addons/mail/models/mail_thread.py
@@ -898,7 +898,7 @@ class MailThread(models.AbstractModel):
 <p>Hello,</p>
 <p>The following email sent to %s cannot be accepted because this is a private email address.
    Only allowed people can contact us at this address.</p>
-</div><blockquote>%s</blockquote>""" % (message.get('to'), message_dict.get('body')),
+</div><blockquote>%s</blockquote>""" % (message.get('to'), message_dict.get('body'))
 
         # Wrong model
         if model and model not in self.env: