diff --git a/frontend/script.js b/frontend/script.js
index 7840429..8e50054 100644
--- a/frontend/script.js
+++ b/frontend/script.js
@@ -27,7 +27,7 @@
         const canPlayType = (canPlayTypeRaw === "maybe") || (canPlayTypeRaw === "probably");
         if(canPlayType) {
             const Button = videojs.getComponent("Button");
-            const DownloadButton = videojs.extend(videojs.getComponent("Component"), {
+            class DownloadButton extends videojs.getComponent("Component") {
                 createEl: () => {
                     const elem = document.createElement("a");
                     elem.href = info.download;
@@ -38,7 +38,7 @@
                     elem.classList.add("vjs-big-download");
                     return elem;
                 }
-            })
+            }
 
             const cbutton = {};
             cbutton.clickHandler = (ev) => {