diff --git a/framework/core/js/forum/src/components/discussion-list-item.js b/framework/core/js/forum/src/components/discussion-list-item.js
index 1ebadb6f4..319debb89 100644
--- a/framework/core/js/forum/src/components/discussion-list-item.js
+++ b/framework/core/js/forum/src/components/discussion-list-item.js
@@ -113,7 +113,7 @@ export default class DiscussionListItem extends Component {
   config(element, isInitialized, context) {
     if (isInitialized) return;
 
-    if (window.ontouchstart !== 'undefined') {
+    if ('ontouchstart' in window) {
       this.$().addClass('slidable');
 
       var slidableInstance = slidable(element);