diff --git a/layouts/shortcodes/audio.html b/layouts/shortcodes/audio.html
index 0ec7634..1ca2b71 100644
--- a/layouts/shortcodes/audio.html
+++ b/layouts/shortcodes/audio.html
@@ -3,8 +3,7 @@
         <source src="{{ index .Params 0 }}" type="audio/mpeg">
     </audio>
     <script>
-        var audio = document.getElementById("audio_player");
-
+        let audio = document.getElementById("audio_player");
         function set_volume(){
             audio.volume = 0.4;
         }