diff --git a/plugins/lazy-yt/assets/javascripts/lazyYT.js b/plugins/lazy-yt/assets/javascripts/lazyYT.js
index 92a3542a062..101196b6c21 100644
--- a/plugins/lazy-yt/assets/javascripts/lazyYT.js
+++ b/plugins/lazy-yt/assets/javascripts/lazyYT.js
@@ -87,7 +87,7 @@
     innerHtml.push("</div>"); // .html5-title-text-wrapper
     innerHtml.push("</div>"); // end of Video title .html5-info-bar
 
-    const prefetchedThumbnail = $el[0].querySelector(".ytp-thumbnail-image");
+    var prefetchedThumbnail = $el[0].querySelector(".ytp-thumbnail-image");
 
     $el
       .css({