diff --git a/static/js/cours.js b/static/js/cours.js
index f959d60..6537fad 100644
--- a/static/js/cours.js
+++ b/static/js/cours.js
@@ -19,11 +19,15 @@ const buildFileTree = (parent, data, location) => {
       li.classList.add("collapsed");
 
       // Toggle collapsing on click
-      li.addEventListener("click", function (e) {
-        if (e.target === li) {
-          li.classList.toggle("collapsed");
-        }
-      });
+      li.addEventListener(
+        "click",
+        (e) => {
+          if (e.target === li) {
+            li.classList.toggle("collapsed");
+          }
+        },
+        { passive: true }
+      );
     } else {
       // File
       const url = window.location.href.split("?")[0];