diff --git a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/OrganizationUnitManager.cs b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/OrganizationUnitManager.cs
index c4a8733787..160e37c900 100644
--- a/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/OrganizationUnitManager.cs
+++ b/modules/identity/src/Volo.Abp.Identity.Domain/Volo/Abp/Identity/OrganizationUnitManager.cs
@@ -148,7 +148,7 @@ public class OrganizationUnitManager : DomainService
         }
     }
 
-    public async Task<List<OrganizationUnit>> FindChildrenAsync(Guid? parentId, bool recursive = false)
+    public virtual async Task<List<OrganizationUnit>> FindChildrenAsync(Guid? parentId, bool recursive = false)
     {
         if (!recursive)
         {