diff --git a/CarRepairShop/CarRepairShopContracts/DI/UnityDependencyContainer.cs b/CarRepairShop/CarRepairShopContracts/DI/UnityDependencyContainer.cs
index 394ccbd..aa9c43c 100644
--- a/CarRepairShop/CarRepairShopContracts/DI/UnityDependencyContainer.cs
+++ b/CarRepairShop/CarRepairShopContracts/DI/UnityDependencyContainer.cs
@@ -19,7 +19,7 @@ namespace CarRepairShopContracts.DI
             _container.AddExtension(new LoggingExtension(factory));
         }
 
-        void IDependencyContainer.RegisterType<T, U>(bool isSingle)
+        public void RegisterType<T, U>(bool isSingle) where U : class, T where T : class
         {
             _container.RegisterType<T, U>(isSingle ? TypeLifetime.Singleton : TypeLifetime.Transient);
         }