diff --git a/addons/mail/static/src/js/mail.js b/addons/mail/static/src/js/mail.js
index b77aa7e111b..a901e77c842 100644
--- a/addons/mail/static/src/js/mail.js
+++ b/addons/mail/static/src/js/mail.js
@@ -1236,7 +1236,6 @@ openerp.mail = function (session) {
             this.last_id = datasets.last_id || false;
             this.parent_id = datasets.parent_id || false;
             this.is_private = datasets.is_private || false;
-            this.is_author = datasets.is_author ||  false,
             this.author_id = datasets.author_id || false;
             this.thread_level = (datasets.thread_level+1) || 0;
             datasets.partner_ids = datasets.partner_ids || [];