diff --git a/mesa/visualization/templates/js/runcontrol.js b/mesa/visualization/templates/js/runcontrol.js
index 9d312f13339..bfe3cf4ee23 100644
--- a/mesa/visualization/templates/js/runcontrol.js
+++ b/mesa/visualization/templates/js/runcontrol.js
@@ -131,7 +131,7 @@ resetModelButton.onclick = () => controller.reset();
 /** Open the websocket connection; support TLS-specific URLs when appropriate */
 const ws = new WebSocket(
   (window.location.protocol === "https:" ? "wss://" : "ws://") +
-    location.host + location.pathname.replace('/spaces','') +
+    location.host + location.pathname.replace('/+','') +
     "/ws"
 );