diff --git a/apps/recorder/interface.html b/apps/recorder/interface.html
index 989d03944..e64e2ebe4 100644
--- a/apps/recorder/interface.html
+++ b/apps/recorder/interface.html
@@ -6,6 +6,7 @@
     <div id="tracks"></div>
 
     <script src="../../core/lib/interface.js"></script>
+    <script src="../../core/js/ui.js"></script>
     <script>
 var domTracks = document.getElementById("tracks");