diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 77ab12ae863..fb03c070213 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -8504,7 +8504,6 @@ function getCommonSubstitutionArray($outputlangs, $onlykey = 0, $exclude = null,
 			// add substitution variables for ticket
 			if (is_object($object) && $object->element == 'ticket') {
 				$substitutionarray['__TICKET_TRACKID__'] = $object->track_id;
-				$substitutionarray['__REF__'] = $object->ref;
 				$substitutionarray['__TICKET_SUBJECT__'] = $object->subject;
 				$substitutionarray['__TICKET_TYPE__'] = $object->type_code;
 				$substitutionarray['__TICKET_SEVERITY__'] = $object->severity_code;