diff --git a/lib/dbh/dbh.class.php b/lib/dbh/dbh.class.php
index 29ed92b5ce..3ffc1d5622 100644
--- a/lib/dbh/dbh.class.php
+++ b/lib/dbh/dbh.class.php
@@ -383,6 +383,8 @@ class dbh
             case 'dm':
                 /* DATE convert to TO_CHAR. */
                 $sql = preg_replace("/\bDATE\(([^)]*)\)/",  "TO_CHAR($1, 'yyyy-mm-dd')", $sql, -1);
+                /* DATE_FORMAT convert to TO_CHAR. */
+                $sql = preg_replace("/\bDATE_FORMAT\(([^)]*)\)/",  "TO_CHAR($1, 'yyyy-mm-dd')", $sql, -1);
 
                 return $sql;