diff --git a/ui/static/ui/button.js b/ui/static/ui/button.js
index af40ead..bbfc0e9 100644
--- a/ui/static/ui/button.js
+++ b/ui/static/ui/button.js
@@ -6,7 +6,7 @@ const count = document.getElementById("COUNT");
 button.addEventListener("click", event => {
     button.disabled = true;
     button.classList.add("is-loading");
-    fetch('/button', {
+    fetch('/button/', {
         method: 'POST',
         headers: {
             'Content-Type': 'application/json',