diff --git a/index.html b/index.html
index 68685b0..e993956 100644
--- a/index.html
+++ b/index.html
@@ -120,11 +120,11 @@
               this.psi.set(0); // set actual value
 
               // Set up websocket connection
-            this.sock = new WebSocket("wss://" + window.location.hostname + "/ws");
-            this.sock.addEventListener('open', function(event) { this.gotWsOpen(event); });
-            this.sock.addEventListener('message', function(event) { this.gotWsMessage(event); });
-            this.sock.addEventListener('error', function(event) { this.gotWsError(event); });
-            this.sock.addEventListener('close', function(event) { this.gotWsClose(event); });
+            this.sock = new WebSocket("wss://" + window.location.hostname + "/ws/");
+            this.sock.addEventListener('open', this.gotWsOpen );
+            this.sock.addEventListener('message', this.gotWsMessage);
+            this.sock.addEventListener('error', this.gotWsError);
+            this.sock.addEventListener('close', this.gotWsClose);
 
             },
             methods: {