diff --git a/IceCreamShop/IceCreamShopContracts/DI/UnityDependencyContainer.cs b/IceCreamShop/IceCreamShopContracts/DI/UnityDependencyContainer.cs
index 7a09e75..133b539 100644
--- a/IceCreamShop/IceCreamShopContracts/DI/UnityDependencyContainer.cs
+++ b/IceCreamShop/IceCreamShopContracts/DI/UnityDependencyContainer.cs
@@ -19,7 +19,7 @@ namespace IceCreamShopContracts.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);
         }