diff --git a/web/templates/setup.html b/web/templates/setup.html
index 511cd06..e253c18 100644
--- a/web/templates/setup.html
+++ b/web/templates/setup.html
@@ -44,7 +44,7 @@
         </ul>
     </div>
     <!-- /#sidebar-wrapper -->
-    <iframe id="preview" style="width:100%" src="{% url 'iframe' encodedurl=url %}"></iframe>
+    <iframe id="preview" style="width:100%" src="{% url 'iframe' encodedurl=encodedurl %}"></iframe>
     <script>
         $(function() {
             function handleResize() {