diff --git a/samples/console/Elsa.Samples.ConsoleApp.Bookmarks/Program.cs b/samples/console/Elsa.Samples.ConsoleApp.Bookmarks/Program.cs
index adf1b64a2..4c5f20584 100644
--- a/samples/console/Elsa.Samples.ConsoleApp.Bookmarks/Program.cs
+++ b/samples/console/Elsa.Samples.ConsoleApp.Bookmarks/Program.cs
@@ -9,7 +9,7 @@ using Microsoft.Extensions.DependencyInjection;
 var services = new ServiceCollection();
 
 // Add Elsa services.
-services.AddElsa();
+services.AddElsa().AddActivity<MyEvent>();
 
 // Build service container.
 var serviceProvider = services.BuildServiceProvider();