diff --git a/charts.html b/charts.html
index d9c3e0d..9cd40c2 100644
--- a/charts.html
+++ b/charts.html
@@ -17,7 +17,7 @@
     const co2Color = 'rgb(194,30,30)';
 
     async function getData() {
-        let urlEndpoint = "/" + "ROOT_URL" + "data/";
+        let urlEndpoint = "/" + ROOT_URL + "data/";
         const pathname = window.location.pathname;
         if (pathname.includes("since")) {
             urlEndpoint += "since/" + pathname.slice(pathname.lastIndexOf("/") + 1);