diff --git a/report/progress/index.php b/report/progress/index.php
index 2895e1343f1..47a0a7191bd 100644
--- a/report/progress/index.php
+++ b/report/progress/index.php
@@ -141,7 +141,7 @@ if ($total) {
         implode(' AND ', $where),
         $where_params,
         $group,
-        $firstnamesort ? 'u.firstname ASC' : 'u.lastname ASC',
+        $firstnamesort ? 'u.firstname ASC, u.lastname ASC' : 'u.lastname ASC, u.firstname ASC',
         $csv ? 0 : COMPLETION_REPORT_PAGE,
         $csv ? 0 : $start,
         $context