diff --git a/src/infrastructure/storage/cos-storage.provider.ts b/src/infrastructure/storage/cos-storage.provider.ts
index 1d52560..ee6b9d8 100644
--- a/src/infrastructure/storage/cos-storage.provider.ts
+++ b/src/infrastructure/storage/cos-storage.provider.ts
@@ -33,7 +33,7 @@ export class CosStorageProvider {
     this.cos = new COS({
       SecretId: secretId,
       SecretKey: secretKey,
-      Domain: domain,
+      ...(domain ? { Domain: domain } : {}),
       Protocol: 'https:',
     });