diff --git a/print/templates/email/osticket-report/sql/tickets.sql b/print/templates/email/osticket-report/sql/tickets.sql
index 4d5f5b13f2..7cb35aaabb 100644
--- a/print/templates/email/osticket-report/sql/tickets.sql
+++ b/print/templates/email/osticket-report/sql/tickets.sql
@@ -19,7 +19,7 @@ SELECT * FROM (
           AND ote.type = 'M'
         LEFT JOIN ost_thread_entry oter ON oth.id = oter.thread_id
           AND oter.type = 'R'
-    WHERE ot.ticket_pid = NULL
+    WHERE ot.ticket_pid IS NULL
       AND ots.state = 'closed'
       AND ot.closed BETWEEN ? AND ?
     ORDER BY oter.created DESC