diff --git a/addons/mail/static/src/js/mail.js b/addons/mail/static/src/js/mail.js
index 96b2184ece9..64164b022a2 100644
--- a/addons/mail/static/src/js/mail.js
+++ b/addons/mail/static/src/js/mail.js
@@ -1416,7 +1416,7 @@ openerp.mail = function (session) {
         message_fetch: function (replace_domain, replace_context, ids, callback) {
             return this.ds_message.call('message_read', [
                     // ids force to read
-                    ids == false ? undefined : ids, 
+                    ids === false ? undefined : ids, 
                     // domain + additional
                     (replace_domain ? replace_domain : this.domain), 
                     // ids allready loaded