diff --git a/packages/schema/src/types/config.ts b/packages/schema/src/types/config.ts
index 7306c5222e..44a1390734 100644
--- a/packages/schema/src/types/config.ts
+++ b/packages/schema/src/types/config.ts
@@ -141,7 +141,7 @@ export interface AppConfigInput extends CustomAppConfig {
   server?: never
 }
 
-type Serializable<T> = T extends Function ? never : T extends Promise<infer U> ? Serializable<U> : T extends Record<string, any> ? { [K in keyof T]: Serializable<T[K]> } : T
+type Serializable<T> = T extends Function ? never : T extends Promise<infer U> ? Serializable<U> : T extends string & {} ? T : T extends Record<string, any> ? { [K in keyof T]: Serializable<T[K]> } : T
 
 export interface NuxtAppConfig {
   head: Serializable<AppHeadMetaObject>
diff --git a/test/fixtures/basic-types/nuxt.config.ts b/test/fixtures/basic-types/nuxt.config.ts
index 3278402fa3..93a409cc04 100644
--- a/test/fixtures/basic-types/nuxt.config.ts
+++ b/test/fixtures/basic-types/nuxt.config.ts
@@ -21,6 +21,13 @@ export default defineNuxtConfig({
       title: Promise.resolve('Nuxt Fixture'),
       // @ts-expect-error Functions are not allowed
       titleTemplate: title => 'test',
+      meta: [
+        {
+          // Allows unknown property
+          property: 'og:thing',
+          content: '1234567890',
+        },
+      ],
     },
     pageTransition: {
       // @ts-expect-error Functions are not allowed