diff --git a/static/sfu.js b/static/sfu.js
index 5b48773..ed0693a 100644
--- a/static/sfu.js
+++ b/static/sfu.js
@@ -93,6 +93,7 @@ function getUsername() {
 function setConnected(connected) {
     let statspan = document.getElementById('statspan');
     let userform = document.getElementById('userform');
+    let disconnectbutton = document.getElementById('disconnectbutton');
     if(connected) {
         clearError();
         statspan.textContent = 'Connected';