diff --git a/mod/assign/gradingtable.php b/mod/assign/gradingtable.php
index 6e772997ad3..0d605c31606 100644
--- a/mod/assign/gradingtable.php
+++ b/mod/assign/gradingtable.php
@@ -302,6 +302,9 @@ class assign_grading_table extends table_sql implements renderable {
                 if (!empty($markerfilter)) {
                     if ($markerfilter == ASSIGN_MARKER_FILTER_NO_MARKER) {
                         $where .= ' AND (uf.allocatedmarker IS NULL OR uf.allocatedmarker = 0)';
+                    } else {
+                        $where .= ' AND uf.allocatedmarker = :markerid';
+                        $params['markerid'] = $markerfilter;
                     }
                 }
             }