diff --git a/grade/report/overview/lib.php b/grade/report/overview/lib.php
index 93dccf0cec6..1b9a8803928 100644
--- a/grade/report/overview/lib.php
+++ b/grade/report/overview/lib.php
@@ -212,7 +212,7 @@ function grade_report_overview_settings_definition(&$mform) {
     }
 
     $mform->addElement('select', 'report_overview_showrank', get_string('showrank', 'grades'), $options);
-    $mform->addHelpButton('report_overview_showrank', 'showrank');
+    $mform->addHelpButton('report_overview_showrank', 'showrank', 'grades');
 
     //showtotalsifcontainhidden
     $options = array(-1 => get_string('default', 'grades'),