diff --git a/include/websock.js b/include/websock.js
index 01a24c3f..b8cc46f6 100644
--- a/include/websock.js
+++ b/include/websock.js
@@ -282,7 +282,7 @@ function init(protocols) {
     // TODO: this sucks, the property should exist on the prototype
     // but it does not.
     try {
-        if (bt && ('binaryType' in (new WebSocket("ws://localhost:17523")))) {
+        if (bt && ('binaryType' in (new WebSocket("wss://localhost:17523")))) {
             Util.Info("Detected binaryType support in WebSockets");
             wsbt = true;
         }