diff --git a/backend/internal/model/constraints_test.go b/backend/internal/model/constraints_test.go
index c0b0d201..16bfd4e9 100644
--- a/backend/internal/model/constraints_test.go
+++ b/backend/internal/model/constraints_test.go
@@ -19,7 +19,7 @@ func TestAccountDefaultValues(t *testing.T) {
 
 	var fetched model.Account
 	assert.NoError(t, db.First(&fetched, acc.ID).Error)
-	assert.Equal(t, "en", fetched.Locale, "Locale should default to 'en'")
+	assert.Equal(t, "zh_CN", fetched.Locale, "Locale should default to 'zh_CN'")
 	assert.Equal(t, "UTC", fetched.Timezone, "Timezone should default to 'UTC'")
 	assert.True(t, fetched.Active, "Active should default to true")
 	assert.Equal(t, "active", fetched.Status, "Status should default to 'active'")