diff --git a/vite.config.ts b/vite.config.ts
index 0466183..61df7ce 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -3,4 +3,8 @@ import react from '@vitejs/plugin-react';
 
 export default defineConfig({
   plugins: [react()],
+  server: {
+    host: true,
+    allowedHosts: ['xslttools.add-ideas.de'], // ← ADD THIS
+  },
 });