diff --git a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkManager.cs b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkManager.cs
index 479cf45117..0a1fcc7a9f 100644
--- a/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkManager.cs
+++ b/framework/src/Volo.Abp.Uow/Volo/Abp/Uow/UnitOfWorkManager.cs
@@ -1,5 +1,4 @@
-using System;
-using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection;
 using Volo.Abp.DependencyInjection;
 
 namespace Volo.Abp.Uow