diff --git a/packages/nuxt/src/app/composables/cookie.ts b/packages/nuxt/src/app/composables/cookie.ts
index be64a70364..09015f8544 100644
--- a/packages/nuxt/src/app/composables/cookie.ts
+++ b/packages/nuxt/src/app/composables/cookie.ts
@@ -69,7 +69,7 @@ export function useCookie<T = string | null | undefined> (name: string, _opts?:
       writeClientCookie(name, cookie.value, opts as CookieSerializeOptions)
 
       cookies[name] = klona(cookie.value)
-      channel?.postMessage(opts.encode(cookie.value as T))
+      channel?.postMessage({ value: opts.encode(cookie.value as T) })
     }
 
     const handleChange = (data: { value?: any, refresh?: boolean }) => {
diff --git a/test/basic.test.ts b/test/basic.test.ts
index 225af98542..abaa830c4e 100644
--- a/test/basic.test.ts
+++ b/test/basic.test.ts
@@ -490,11 +490,13 @@ describe('nuxt composables', () => {
     expect(await extractCookie()).toEqual({ foo: 'bar' })
     await page.getByText('Change cookie').click()
     expect(await extractCookie()).toEqual({ foo: 'baz' })
+    let text = await page.innerText('pre')
+    expect(text).toContain('baz')
     await page.getByText('Change cookie').click()
     expect(await extractCookie()).toEqual({ foo: 'bar' })
-    await page.evaluate(() => document.cookie = 'updated=foobar')
+    await page.evaluate(() => document.cookie = `browser-object-default=${encodeURIComponent('{"foo":"foobar"}')}`)
     await page.getByText('Refresh cookie').click()
-    const text = await page.innerText('pre')
+    text = await page.innerText('pre')
     expect(text).toContain('foobar')
     await page.close()
   })
diff --git a/test/fixtures/basic/pages/cookies.vue b/test/fixtures/basic/pages/cookies.vue
index b4d2dfb67a..7a0c2ffb12 100644
--- a/test/fixtures/basic/pages/cookies.vue
+++ b/test/fixtures/basic/pages/cookies.vue
@@ -5,7 +5,6 @@ useCookie('set').value = 'set'
 useCookie('set-to-null').value = null
 useCookie('set-to-null-with-default', () => 'default').value = null
 
-const updated = useCookie('updated')
 // the next set are all sent by browser
 useCookie('browser-accessed-but-not-used')
 useCookie('browser-accessed-with-default-value', () => 'default')
@@ -13,7 +12,8 @@ useCookie('browser-set').value = 'set'
 useCookie('browser-set-to-null').value = null
 useCookie('browser-set-to-null-with-default', () => 'default').value = null
 
-const objectCookie = useCookie('browser-object-default', {
+const objectCookie = useCookie('browser-object-default')
+const objectCookieSecond = useCookie('browser-object-default', {
   default: () => ({ foo: 'bar' })
 })
 </script>
@@ -21,11 +21,11 @@ const objectCookie = useCookie('browser-object-default', {
 <template>
   <div>
     <div>cookies testing page</div>
-    <pre>{{ updated }}</pre>
+    <pre>{{ objectCookieSecond.foo }}</pre>
     <button @click="objectCookie.foo === 'baz' ? objectCookie.foo = 'bar' : objectCookie.foo = 'baz'">
       Change cookie
     </button>
-    <button @click="refreshCookie('updated')">
+    <button @click="refreshCookie('browser-object-default')">
       Refresh cookie
     </button>
   </div>