diff --git a/charts.html b/charts.html
index 3b5e922..68c9479 100644
--- a/charts.html
+++ b/charts.html
@@ -17,8 +17,9 @@
 
     async function getData() {
         let urlEndpoint = "data/";
-        if (window.location.includes("since")) {
-            urlEndpoint += "since/" + window.location.slice(window.location.lastIndexOf("/") + 1);
+        const pathname = window.location.pathname;
+        if (pathname.includes("since")) {
+            urlEndpoint += "since/" + pathname.slice(pathname.lastIndexOf("/") + 1);
         }
         const data = await fetch(urlEndpoint);
         return transformData(await data.json());