diff --git a/js/tests/visual/dropdown.html b/js/tests/visual/dropdown.html
index 455a4f5716..ced3fdb7d5 100644
--- a/js/tests/visual/dropdown.html
+++ b/js/tests/visual/dropdown.html
@@ -92,6 +92,7 @@
 <script src="../vendor/jquery.min.js"></script>
 <script src="../../transition.js"></script>
 <script src="../../dropdown.js"></script>
+<script src="../../collapse.js"></script>
 
 </body>
 </html>