diff --git a/vite.config.js b/vite.config.js
index d98d480..06b9209 100644
--- a/vite.config.js
+++ b/vite.config.js
@@ -16,6 +16,9 @@ export default defineConfig({
   },
   preview: {
     port: 4173,
-    host: true
+    host: true,
+    // `vite preview` is our public demo server (trycloudflare etc.) — accept
+    // any Host header; static assets only, nothing to poison.
+    allowedHosts: true
   }
 });