diff --git a/src/Volo.Abp.Ddd/Volo/Abp/Application/Services/CrudAppServiceBase.cs b/src/Volo.Abp.Ddd/Volo/Abp/Application/Services/CrudAppServiceBase.cs
index 0e7e37dcab..f3441775a0 100644
--- a/src/Volo.Abp.Ddd/Volo/Abp/Application/Services/CrudAppServiceBase.cs
+++ b/src/Volo.Abp.Ddd/Volo/Abp/Application/Services/CrudAppServiceBase.cs
@@ -4,6 +4,7 @@ using System.Linq.Dynamic.Core;
 using Volo.Abp.Application.Dtos;
 using Volo.Abp.Domain.Entities;
 using Volo.Abp.Domain.Repositories;
+using Volo.Abp.ObjectMapping;
 
 namespace Volo.Abp.Application.Services
 {
diff --git a/src/Volo.Abp.Ddd/Volo/Abp/Domain/Entities/IEntity.cs b/src/Volo.Abp.Ddd/Volo/Abp/Domain/Entities/IEntity.cs
index 4cc25837d1..2f19d591f6 100644
--- a/src/Volo.Abp.Ddd/Volo/Abp/Domain/Entities/IEntity.cs
+++ b/src/Volo.Abp.Ddd/Volo/Abp/Domain/Entities/IEntity.cs
@@ -18,6 +18,6 @@
         /// <summary>
         /// Unique identifier for this entity.
         /// </summary>
-        TKey Id { get; set; }
+        TKey Id { get; set; } //TODO: Consider to remove setter and make it protected in Entity class
     }
 }