diff --git a/locallib.php b/locallib.php
index 554e353..2cc0373 100644
--- a/locallib.php
+++ b/locallib.php
@@ -24,8 +24,9 @@
 
 function report_componentgrades_get_students($courseid) {
     global $DB;
-    return $DB->get_records_sql('SELECT stu.id AS userid, stu.idnumber AS idnumber, stu.firstname, stu.lastname, stu.username AS student
-        FROM {user} AS stu
+        return $DB->get_records_sql('SELECT (@id := @id +1) id,stu.id AS userid, stu.idnumber AS idnumber, stu.firstname, stu.lastname, stu.username AS student
+        FROM (select @id :=0 id) id,
+        {user} AS stu
         JOIN {user_enrolments} ue ON ue.userid = stu.id
         JOIN {enrol} enr ON ue.enrolid = enr.id
         WHERE enr.courseid = ?
@@ -113,4 +114,4 @@ function report_componentgrades_add_data($sheet, $students, $gradinginfopos, $me
             }
         }
     }
-}
\ No newline at end of file
+}