diff --git a/Rules b/Rules
index 40dc322..80534d4 100644
--- a/Rules
+++ b/Rules
@@ -38,6 +38,7 @@ compile("/js/index.tsx") do
 end
 
 compile("/html/index.html") do
+  filter(:erb)
   write("/index.html")
   locales.each do |locale|
     write("/#{locale}/index.html")
diff --git a/src/html/index.html b/src/html/index.html
index 4c3b24f..f0d49ed 100644
--- a/src/html/index.html
+++ b/src/html/index.html
@@ -6,7 +6,10 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
   </head>
   <body>
-    <div class="app mount root h-full"></div>
+    <div
+      class="app mount root h-full"
+      data-audio-base-url="<%= audio_base_url %>">
+    </div>
     <script src="/js/index.js"></script>
   </body>
 </html>
