diff --git a/sbas/templates/sbas/exam_start.html b/sbas/templates/sbas/exam_start.html
index dd612491..9da66bc9 100755
--- a/sbas/templates/sbas/exam_start.html
+++ b/sbas/templates/sbas/exam_start.html
@@ -11,7 +11,7 @@
 <script type="text/javascript">
     $(document).ready(function () {
         let cid = $("#cid-box").val();
-        window.location.replace("{% url 'sbas:question_detail' pk=exam.pk sk=0 cid='${cid}' %}");
+        window.location.replace("{% url 'sbas:question_detail' pk=exam.pk sk=0 cid='0000000' %}".replace("0000000", cid));
     });
 </script>
 {% endblock %}