diff --git a/lib/cronlib.php b/lib/cronlib.php
index cc5bf04ac66..4c200f61b3c 100644
--- a/lib/cronlib.php
+++ b/lib/cronlib.php
@@ -325,7 +325,7 @@ function cron_run() {
         mtrace ('Built context paths');
 
         if (!empty($CFG->messagingdeletereadnotificationsdelay)) {
-            $notificationdeletetime = time() - $CFG->messagingdeletereadnotificationsdelay; //604800; //1 week ago
+            $notificationdeletetime = time() - $CFG->messagingdeletereadnotificationsdelay;
             $DB->delete_records_select('message_read', 'notification=1 AND timeread<:notificationdeletetime', array('notificationdeletetime'=>$notificationdeletetime));
             mtrace('Cleaned up read notifications');
         }