diff --git a/modules/identity/test/Volo.Abp.Identity.MongoDB.Tests/Volo/Abp/Identity/MongoDB/OrganizationUnitRepository_Tests.cs b/modules/identity/test/Volo.Abp.Identity.MongoDB.Tests/Volo/Abp/Identity/MongoDB/OrganizationUnitRepository_Tests.cs
index e60b6f21d4..dc134f9974 100644
--- a/modules/identity/test/Volo.Abp.Identity.MongoDB.Tests/Volo/Abp/Identity/MongoDB/OrganizationUnitRepository_Tests.cs
+++ b/modules/identity/test/Volo.Abp.Identity.MongoDB.Tests/Volo/Abp/Identity/MongoDB/OrganizationUnitRepository_Tests.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Text;
+using Xunit;
 
 namespace Volo.Abp.Identity.MongoDB
 {