diff --git a/packages/integrations/vercel/src/serverless/entrypoint.ts b/packages/integrations/vercel/src/serverless/entrypoint.ts
index 876ab6b07f..a881d701ab 100644
--- a/packages/integrations/vercel/src/serverless/entrypoint.ts
+++ b/packages/integrations/vercel/src/serverless/entrypoint.ts
@@ -8,14 +8,15 @@ import {
 	ASTRO_PATH_PARAM,
 } from './adapter.js';
 
+// Run polyfills immediately so any dependent code can use the globals
+applyPolyfills();
+
 // Won't throw if the virtual module is not available because it's not supported in
 // the users's astro version or if astro:env is not enabled in the project
 await import('astro/env/setup')
 	.then((mod) => mod.setGetEnv((key) => process.env[key]))
 	.catch(() => {});
 
-applyPolyfills();
-
 export const createExports = (
 	manifest: SSRManifest,
 	{ middlewareSecret, skewProtection }: { middlewareSecret: string; skewProtection: boolean },