diff --git a/src/pages/robots.txt.ts b/src/pages/robots.txt.ts
index 76c1a23b..cf9107f9 100644
--- a/src/pages/robots.txt.ts
+++ b/src/pages/robots.txt.ts
@@ -2,7 +2,7 @@ import type { APIRoute } from "astro";
 
 const robotsTxt = `
 User-agent: *
-Allow: /
+Disallow: /_astro/
 
 Sitemap: ${new URL("sitemap-index.xml", import.meta.env.SITE).href}
 `.trim();