diff --git a/packages/nuxt/package.json b/packages/nuxt/package.json
index 0833fea9db..816032be39 100644
--- a/packages/nuxt/package.json
+++ b/packages/nuxt/package.json
@@ -73,6 +73,7 @@
     "h3": "^1.6.4",
     "hookable": "^5.5.3",
     "jiti": "^1.18.2",
+    "klona": "^2.0.6",
     "knitwork": "^1.0.0",
     "local-pkg": "^0.4.3",
     "magic-string": "^0.30.0",
diff --git a/packages/nuxt/src/app/config.ts b/packages/nuxt/src/app/config.ts
index 68633fcf5a..77efe98805 100644
--- a/packages/nuxt/src/app/config.ts
+++ b/packages/nuxt/src/app/config.ts
@@ -1,4 +1,5 @@
 import { reactive } from 'vue'
+import { klona } from 'klona'
 import type { AppConfig } from 'nuxt/schema'
 import { useNuxtApp } from './nuxt'
 // @ts-expect-error virtual file
@@ -37,7 +38,7 @@ function deepAssign (obj: any, newObj: any) {
 export function useAppConfig (): AppConfig {
   const nuxtApp = useNuxtApp()
   if (!nuxtApp._appConfig) {
-    nuxtApp._appConfig = reactive(__appConfig) as AppConfig
+    nuxtApp._appConfig = (process.server ? klona(__appConfig) : reactive(__appConfig)) as AppConfig
   }
   return nuxtApp._appConfig
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b6b4bd15ac..0237169925 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -614,6 +614,9 @@ importers:
       jiti:
         specifier: ^1.18.2
         version: 1.18.2
+      klona:
+        specifier: ^2.0.6
+        version: 2.0.6
       knitwork:
         specifier: ^1.0.0
         version: 1.0.0
diff --git a/test/bundle.test.ts b/test/bundle.test.ts
index c4dec4c74f..b708de8b61 100644
--- a/test/bundle.test.ts
+++ b/test/bundle.test.ts
@@ -51,7 +51,7 @@ describe.skipIf(isWindows || process.env.TEST_BUILDER === 'webpack' || process.e
     expect(roundToKilobytes(stats.server.totalBytes)).toMatchInlineSnapshot('"92.4k"')
 
     const modules = await analyzeSizes('node_modules/**/*', serverDir)
-    expect(roundToKilobytes(modules.totalBytes)).toMatchInlineSnapshot('"2654k"')
+    expect(roundToKilobytes(modules.totalBytes)).toMatchInlineSnapshot('"2657k"')
 
     const packages = modules.files
       .filter(m => m.endsWith('package.json'))
@@ -79,6 +79,7 @@ describe.skipIf(isWindows || process.env.TEST_BUILDER === 'webpack' || process.e
         "h3",
         "hookable",
         "iron-webcrypto",
+        "klona",
         "node-fetch-native",
         "ofetch",
         "ohash",