diff --git a/include/staff/tickets.inc.php b/include/staff/tickets.inc.php
index 624376c9b7b0c412682a00e5fcaf47cb6ddd7976..f02ae8dc16cfd5068de4be809d331f3e1a9abce7 100644
--- a/include/staff/tickets.inc.php
+++ b/include/staff/tickets.inc.php
@@ -227,7 +227,7 @@ $pageNav->setURL('tickets.php',$qstr.'&sort='.urlencode($_REQUEST['sort']).'&ord
 $qselect.=' ,count(attach.attach_id) as attachments '
          .' ,count(DISTINCT thread.id) as thread_count '
          .' ,IF(ticket.duedate IS NULL,IF(sla.id IS NULL, NULL, DATE_ADD(ticket.created, INTERVAL sla.grace_period HOUR)), ticket.duedate) as duedate '
-         .' ,GREATEST(IFNULL(ticket.lastmessage, 0), IFNULL(ticket.reopened, 0), ticket.created) as effective_date '
+         .' ,CAST(GREATEST(IFNULL(ticket.lastmessage, 0), IFNULL(ticket.reopened, 0), ticket.created) as datetime) as effective_date '
          .' ,CONCAT_WS(" ", staff.firstname, staff.lastname) as staff, team.name as team '
          .' ,IF(staff.staff_id IS NULL,team.name,CONCAT_WS(" ", staff.lastname, staff.firstname)) as assigned '
          .' ,IF(ptopic.topic_pid IS NULL, topic.topic, CONCAT_WS(" / ", ptopic.topic, topic.topic)) as helptopic ';