diff --git a/addons/mail/static/src/js/mail.js b/addons/mail/static/src/js/mail.js
index e1625089a51..99330e7a3df 100644
--- a/addons/mail/static/src/js/mail.js
+++ b/addons/mail/static/src/js/mail.js
@@ -547,7 +547,7 @@ openerp.mail = function (session) {
         /* return true if all file are complete else return false and make an alert */
         do_check_attachment_upload: function () {
             if (_.find(this.attachment_ids, function (file) {return file.upload;})) {
-                this.do_warn(session.web._t('Attachment error :'), session.web._t('Please, wait while the file is uploading.'));
+                this.do_warn(session.web.qweb.render('mail.error_upload'), session.web.qweb.render('mail.error_upload_please_wait'));
                 return false;
             } else {
                 return true;
diff --git a/addons/mail/static/src/xml/mail.xml b/addons/mail/static/src/xml/mail.xml
index f10770a27e1..5e978e9d5b3 100644
--- a/addons/mail/static/src/xml/mail.xml
+++ b/addons/mail/static/src/xml/mail.xml
@@ -183,6 +183,7 @@
         error message for uploading
         -->
     <t t-name="mail.error_upload">Uploading error</t>
+    <t t-name="mail.error_upload_please_wait">Please, wait while the file is uploading.</t>
 
     <!--
         record_thread main template