diff --git a/addons/mail/models/mail_message.py b/addons/mail/models/mail_message.py
index 76936a961c1..fdd38108923 100644
--- a/addons/mail/models/mail_message.py
+++ b/addons/mail/models/mail_message.py
@@ -101,7 +101,7 @@ class Message(models.Model):
     tracking_value_ids = fields.One2many(
         'mail.tracking.value', 'mail_message_id',
         string='Tracking values',
-        help='Tracked values are stored in a separate model. This field allow to reconstruct'
+        help='Tracked values are stored in a separate model. This field allow to reconstruct '
              'the tracking and to generate statistics on the model.')
     # mail gateway
     no_auto_thread = fields.Boolean(