diff --git a/packages/next/build/index.ts b/packages/next/build/index.ts
index 96ae19b413b5..dd87c15fede9 100644
--- a/packages/next/build/index.ts
+++ b/packages/next/build/index.ts
@@ -334,7 +334,7 @@ export default async function build(
         }
       }),
     dataRoutes: [],
-    i18n: config.experimental.i18n,
+    i18n: config.experimental.i18n || undefined,
   }
 
   await promises.mkdir(distDir, { recursive: true })
diff --git a/test/integration/i18n-support/test/index.test.js b/test/integration/i18n-support/test/index.test.js
index c34cdc488221..94e4eea25fa9 100644
--- a/test/integration/i18n-support/test/index.test.js
+++ b/test/integration/i18n-support/test/index.test.js
@@ -27,6 +27,31 @@ let appPort
 const locales = ['en-US', 'nl-NL', 'nl-BE', 'nl', 'fr-BE', 'fr', 'en']
 
 function runTests(isDev) {
+  if (!isDev) {
+    it('should add i18n config to routes-manifest', async () => {
+      const routesManifest = await fs.readJSON(
+        join(appDir, '.next/routes-manifest.json')
+      )
+
+      expect(routesManifest.i18n).toEqual({
+        locales: ['en-US', 'nl-NL', 'nl-BE', 'nl', 'fr-BE', 'fr', 'en'],
+        defaultLocale: 'en-US',
+        domains: [
+          {
+            http: true,
+            domain: 'example.be',
+            defaultLocale: 'nl-BE',
+          },
+          {
+            http: true,
+            domain: 'example.fr',
+            defaultLocale: 'fr',
+          },
+        ],
+      })
+    })
+  }
+
   it('should update asPath on the client correctly', async () => {
     for (const check of ['en', 'En']) {
       const browser = await webdriver(appPort, `/${check}`)