diff --git a/htdocs/map.js b/htdocs/map.js
index c912a14d..95cfa97b 100644
--- a/htdocs/map.js
+++ b/htdocs/map.js
@@ -13,7 +13,7 @@
     var expectedLocator;
     if (query.locator) expectedLocator = query.locator;
 
-    var protocol = window.location.protocol == 'https' ? 'wss' : 'ws';
+    var protocol = window.location.protocol.match(/https/) ? 'wss' : 'ws';
 
     var href = window.location.href;
     var index = href.lastIndexOf('/');
diff --git a/htdocs/openwebrx.js b/htdocs/openwebrx.js
index b30a6050..25c094c0 100644
--- a/htdocs/openwebrx.js
+++ b/htdocs/openwebrx.js
@@ -1526,7 +1526,7 @@ function on_ws_error() {
 var ws;
 
 function open_websocket() {
-    var protocol = window.location.protocol == 'https' ? 'wss' : 'ws';
+    var protocol = window.location.protocol.match(/https/) ? 'wss' : 'ws';
 
     var href = window.location.href;
     var index = href.lastIndexOf('/');