diff --git a/grade/report/grader/lib.php b/grade/report/grader/lib.php
index c91394a..dd1f4a6 100644
--- a/grade/report/grader/lib.php
+++ b/grade/report/grader/lib.php
@@ -848,6 +848,7 @@ class grade_report_grader extends grade_report {
                 unset($hidingaffected);
             }
 
+            $this->rowcount++;
             $itemrow = new html_table_row();
             $itemrow->id = 'user_'.$userid;
             $itemrow->attributes['class'] = $rowclasses[$this->rowcount % 2];