diff --git a/main/exercise/exercise_show.php b/main/exercise/exercise_show.php
index 13d717cae5..09e3d53c0d 100755
--- a/main/exercise/exercise_show.php
+++ b/main/exercise/exercise_show.php
@@ -197,7 +197,7 @@ if ($action != 'export') {
         }
 
         function getFCK(vals, marksid) {
-            var f = document.getElementById('myform');
+            var f = document.getElementById('form-email');
 
             var m_id = marksid.split(',');
             for (var i = 0; i < m_id.length; i++) {