diff --git a/packages/next-polyfill-nomodule/src/index.js b/packages/next-polyfill-nomodule/src/index.js
index <HASH>..<HASH> 100644
--- a/packages/next-polyfill-nomodule/src/index.js
+++ b/packages/next-polyfill-nomodule/src/index.js
@@ -3,6 +3,7 @@ import 'core-js/features/array/fill'
 import 'core-js/features/array/find'
 import 'core-js/features/array/find-index'
 import 'core-js/features/array/flat-map'
+import 'core-js/features/array/flat'
 import 'core-js/features/array/from'
 import 'core-js/features/array/includes'
 import 'core-js/features/array/iterator'
Add Array.flat polyfill to nomodule-polyfills (#<I>)

* Add Array.flat polyfill to nomodule-polyfills

* Fix code style issue