diff --git a/configtest/next/eslint.config.mjs b/configtest/next/eslint.config.mjs
index 9e9281a..0aeaea3 100644
--- a/configtest/next/eslint.config.mjs
+++ b/configtest/next/eslint.config.mjs
@@ -1,7 +1,7 @@
 import config from '@hatena/eslint-config-hatena/flat';
 import globals from 'globals';
 
-export default config({ next: true }, [
+export default config({ next: 'strict' }, [
   {
     languageOptions: {
       globals: { ...globals.node },
diff --git a/lib/config/index.js b/lib/config/index.js
index 0819285..317f79f 100644
--- a/lib/config/index.js
+++ b/lib/config/index.js
@@ -140,7 +140,7 @@ function config(options, configs) {
               {
                 rules: {
                   ...nextPlugin.configs.recommended.rules,
-                  ...(next === 'strict' ? { rules: nextPlugin.configs['core-web-vitals'].rules } : {}),
+                  ...(next === 'strict' ? nextPlugin.configs['core-web-vitals'].rules : {}),
                 },
               },
             ],