diff --git a/htdocs/ticket/class/ticket.class.php b/htdocs/ticket/class/ticket.class.php
index cf1e2502676..f5132809dd1 100644
--- a/htdocs/ticket/class/ticket.class.php
+++ b/htdocs/ticket/class/ticket.class.php
@@ -2753,7 +2753,8 @@ class Ticket extends CommonObject
                     $conf->global->MAIN_MAIL_AUTOCOPY_TO = '';
                 }
                 include_once DOL_DOCUMENT_ROOT.'/core/class/CMailFile.class.php';
-                $mailfile = new CMailFile($subject, $receiver, $from, $message_to_send, $filepath, $mimetype, $filename, $sendtocc, '', $deliveryreceipt, -1);
+				$trackid = "tic".$this->id;
+                $mailfile = new CMailFile($subject, $receiver, $from, $message_to_send, $filepath, $mimetype, $filename, $sendtocc, '', $deliveryreceipt, -1, '', '', $trackid);
                 if ($mailfile->error) {
                     setEventMessages($mailfile->error, null, 'errors');
                 } else {