diff --git a/Samples/TripleAdd/Controllers/HomeController.cs b/Samples/TripleAdd/Controllers/HomeController.cs
index 8f35725..6428958 100644
--- a/Samples/TripleAdd/Controllers/HomeController.cs
+++ b/Samples/TripleAdd/Controllers/HomeController.cs
@@ -16,7 +16,7 @@ namespace TripleAdd.Controllers
         }
 
         private static IUtility? utility;
-        private static IMachine<string>? machine;
+        private static BaseMachine<string, string>? machine;
 
         public ActionResult Index()
         {