diff --git a/src/core/Elsa.Core/ElsaOptions.cs b/src/core/Elsa.Core/ElsaOptions.cs
index 4d8a72448..c9e987149 100644
--- a/src/core/Elsa.Core/ElsaOptions.cs
+++ b/src/core/Elsa.Core/ElsaOptions.cs
@@ -45,7 +45,7 @@ namespace Elsa
         
         public ServiceFactory<IActivity> ActivityFactory { get; } = new();
         public ServiceFactory<IWorkflow> WorkflowFactory { get; } = new();
-        public IList<Type> ActivityTypes { get; } = new List<Type>();
+        public IEnumerable<Type> ActivityTypes => ActivityFactory.Types;
 
         public IList<Type> WorkflowTypes { get; } = new List<Type>();
         public IList<Type> MessageTypes { get; } = new List<Type>();