diff --git a/flasher.js b/flasher.js
index 7361a55..e293edd 100644
--- a/flasher.js
+++ b/flasher.js
@@ -147,7 +147,7 @@ function setup() {
   }
 
   const flashing = reactive({
-    supported: 'Serial' in window,
+    supported: 'Serial' in window || 'serial' in window.navigator,
     instance: null,
     locked: false,
     percent: 0,