diff --git a/mod/assign/gradingtable.php b/mod/assign/gradingtable.php
index acaef9e5e85..8b6a233feae 100644
--- a/mod/assign/gradingtable.php
+++ b/mod/assign/gradingtable.php
@@ -231,6 +231,9 @@ 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;
                     }
                 }
             }