diff --git a/src/ApplicationCore/Specifications/BaseSpecification.cs b/src/ApplicationCore/Specifications/BaseSpecification.cs
index e39a86d..4194cc4 100644
--- a/src/ApplicationCore/Specifications/BaseSpecification.cs
+++ b/src/ApplicationCore/Specifications/BaseSpecification.cs
@@ -7,7 +7,7 @@ namespace ApplicationCore.Specifications
 {
     public abstract class BaseSpecification<T> : ISpecification<T>
     {
-        public BaseSpecification(Expression<Func<T, bool>> criteria)
+        protected BaseSpecification(Expression<Func<T, bool>> criteria)
         {
             Criteria = criteria;
         }
diff --git a/src/ApplicationCore/Specifications/BasketWithItemsSpecification.cs b/src/ApplicationCore/Specifications/BasketWithItemsSpecification.cs
index 5608dc6..cb3dc40 100644
--- a/src/ApplicationCore/Specifications/BasketWithItemsSpecification.cs
+++ b/src/ApplicationCore/Specifications/BasketWithItemsSpecification.cs
@@ -2,7 +2,7 @@
 
 namespace ApplicationCore.Specifications
 {
-    public class BasketWithItemsSpecification : BaseSpecification<Basket>
+    public sealed class BasketWithItemsSpecification : BaseSpecification<Basket>
     {
         public BasketWithItemsSpecification(int basketId)
             :base(b => b.Id == basketId)