diff --git a/backend/src/index.ts b/backend/src/index.ts
index a371332..b485ae9 100644
--- a/backend/src/index.ts
+++ b/backend/src/index.ts
@@ -49,6 +49,14 @@ app.get('/{*path}', (req, res, next) => {
   if (req.path.startsWith(apiRoot)) return next();
   if (req.path === '/_cron/tick') return next();
   
+  // Do not serve HTML for static assets or requests that do not accept HTML
+  const isAsset = /\.[a-z0-9]{2,4}$/i.test(req.path);
+  const acceptsHtml = req.headers.accept?.includes('text/html');
+  if (isAsset || !acceptsHtml) {
+    res.status(404).json({ success: false, error: 'Not found' });
+    return;
+  }
+  
   if (req.path.startsWith('/mobile')) {
     res.sendFile(path.join(publicDir, 'mobile/index.html'), (err) => {
       if (err) next();
diff --git a/mobile/app.json b/mobile/app.json
index 2ffc6b8..944c4e8 100644
--- a/mobile/app.json
+++ b/mobile/app.json
@@ -23,8 +23,7 @@
     "web": {
       "bundler": "metro",
       "output": "single",
-      "favicon": "./assets/images/favicon.png",
-      "baseUrl": "/mobile"
+      "favicon": "./assets/images/favicon.png"
     },
     "plugins": [
       "expo-router",
@@ -32,7 +31,8 @@
       "expo-web-browser"
     ],
     "experiments": {
-      "typedRoutes": true
+      "typedRoutes": true,
+      "baseUrl": "/mobile"
     }
   }
 }
\ No newline at end of file