diff --git a/astro.config.mjs b/astro.config.mjs
index d9d1628..0ba1893 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -1,11 +1,31 @@
 import { defineConfig } from "astro/config";
 
 import node from "@astrojs/node";
+import { readFile, writeFile } from 'node:fs/promises';
+import { fileURLToPath } from 'node:url';
+
+let assets = []
 
 // https://astro.build/config
 export default defineConfig({
   output: "server",
   adapter: node({
     mode: "middleware"
-  })
+  }),
+  integrations: [
+    {
+      'name': 'astro-cozy-build',
+      'hooks': {
+        'astro:build:ssr': (options) => {
+          assets = options.manifest.assets.filter(ass => !ass.includes('sw.js'))
+          console.log('build-cozy', assets)
+        },
+        'astro:build:done': async ({dir}) => {
+          const outFile = fileURLToPath(new URL('./sw.js', dir));
+          const originalScript = await readFile(outFile);
+          await writeFile(outFile, 'const assets = ' + JSON.stringify(assets) + ';' + originalScript);
+        }
+      }
+    }
+  ]
 });
\ No newline at end of file
diff --git a/public/sw.js b/public/sw.js
index 2fcbc7d..c5e1bdc 100644
--- a/public/sw.js
+++ b/public/sw.js
@@ -70,7 +70,7 @@ self.addEventListener('install', (event) => {
     event.waitUntil(
         addResourcesToCache([
             './',
-            './favicon.ico',
+            ...(assets ?? [])
         ])
     );
 });
diff --git a/src/pages/index.astro b/src/pages/index.astro
index 039b300..2a0e34d 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -48,26 +48,26 @@ navigator.serviceWorker.getRegistrations().then(registrations => {
     } 
 });
 
-  // const registerSW = async () => {
-  //   if ("serviceWorker" in navigator) {
-  //     try {
-  //       const registration = await navigator.serviceWorker.register("/sw.js", {
-  //         scope: "/",
-  //       });
-  //       if (registration.installing) {
-  //         console.log("Service worker installing");
-  //       } else if (registration.waiting) {
-  //         console.log("Service worker installed");
-  //       } else if (registration.active) {
-  //         console.log("Service worker active");
-  //       }
-  //     } catch (error) {
-  //       console.error(`Registration failed with ${error}`);
-  //     }
-  //   } else {
-  //     console.log('browser doesn\'t support service workers. boo')
-  //   }
-  // }
+  const registerSW = async () => {
+    if ("serviceWorker" in navigator) {
+      try {
+        const registration = await navigator.serviceWorker.register("/sw.js", {
+          scope: "/",
+        });
+        if (registration.installing) {
+          console.log("Service worker installing");
+        } else if (registration.waiting) {
+          console.log("Service worker installed");
+        } else if (registration.active) {
+          console.log("Service worker active");
+        }
+      } catch (error) {
+        console.error(`Registration failed with ${error}`);
+      }
+    } else {
+      console.log('browser doesn\'t support service workers. boo')
+    }
+  }
 
-  // registerSW();
+  registerSW();
 </script>
\ No newline at end of file