diff --git a/examples/hello-world/pages/index.js b/examples/hello-world/pages/index.js
index 88fdc555b860..dd2c3af8cab8 100644
--- a/examples/hello-world/pages/index.js
+++ b/examples/hello-world/pages/index.js
@@ -10,7 +10,3 @@ export default function IndexPage() {
     </div>
   )
 }
-
-export const config = {
-  runtime: 'edge',
-}
diff --git a/packages/next/build/entries.ts b/packages/next/build/entries.ts
index c6d3bc0a3485..43be2a3743e3 100644
--- a/packages/next/build/entries.ts
+++ b/packages/next/build/entries.ts
@@ -112,7 +112,7 @@ export async function getPageRuntime(
     encoding: 'utf8',
   })
   // branch prunes for entry page without runtime option
-  if (pageContent.includes('export const config =')) {
+  if (pageContent.includes('runtime:')) {
     const { body } = await parse(pageContent, {
       filename: pageFilePath,
       isModule: true,