diff --git a/packages/astro/src/core/create-vite.ts b/packages/astro/src/core/create-vite.ts
index a6caf6b29..8d87620af 100644
--- a/packages/astro/src/core/create-vite.ts
+++ b/packages/astro/src/core/create-vite.ts
@@ -30,7 +30,7 @@ const ALWAYS_EXTERNAL = new Set([
   'unified',
   'whatwg-url',
   'astro/dist/core/config.js',
-  'rollup'
+  'rollup',
 ]);
 
 // note: ssr is still an experimental API hence the type omission