diff --git a/vnc.html b/vnc.html
index b96b0aa..3565edf 100644
--- a/vnc.html
+++ b/vnc.html
@@ -65,7 +65,19 @@
     <!-- begin scripts -->
     <!-- promise polyfills promises for IE11 -->
     <script src="vendor/promise.js"></script>
-    <script src="vendor/browser-es-module-loader/dist/browser-es-module-loader.js"></script>
+    <!-- ES2015/ES6 modules polyfill -->
+    <script type="module">
+        window._noVNC_has_module_support = true;
+    </script>
+    <script>
+        window.addEventListener("load", function() {
+            if (window._noVNC_has_module_support) return;
+            var loader = document.createElement("script");
+            loader.src = "vendor/browser-es-module-loader/dist/browser-es-module-loader.js";
+            document.head.appendChild(loader);
+        });
+    </script>
+    <!-- actual script modules -->
     <script type="module" src="app/ui.js"></script>
     <!-- end scripts -->
 </head>