diff --git a/packages/integrations/vercel/test/serverless-prerender.test.js b/packages/integrations/vercel/test/serverless-prerender.test.js
index 5372f46047..5b75418c9f 100644
--- a/packages/integrations/vercel/test/serverless-prerender.test.js
+++ b/packages/integrations/vercel/test/serverless-prerender.test.js
@@ -22,7 +22,7 @@ describe('Serverless prerender', () => {
 		const [file] = await fixture.glob(
 			'../.vercel/output/functions/_render.func/packages/integrations/vercel/test/fixtures/serverless-prerender/.vercel/output/_functions/pages/_image.astro.mjs'
 		);
-		const contents = await fixture.readfile(file);
+		const contents = await fixture.readFile(file);
 		assert.ok(!contents.includes('const outDir ='), "outDir is tree-shaken if it's not imported");
 	});