diff --git a/src/Umbraco.Core/TypeFinder.cs b/src/Umbraco.Core/TypeFinder.cs
index 9ed06d4161..ebc8edee5c 100644
--- a/src/Umbraco.Core/TypeFinder.cs
+++ b/src/Umbraco.Core/TypeFinder.cs
@@ -508,7 +508,7 @@ namespace Umbraco.Core
                     foreach (var typeToSearch in subTypesToSearch)
                     {
                         //recursively find the types inheriting from this sub type in the other non-scanned assemblies.
-                        var foundTypes = GetClasses(typeToSearch, otherAssemblies, onlyConcreteClasses);
+                        var foundTypes = GetClasses(typeToSearch, otherAssemblies, onlyConcreteClasses, additionalFilter);
                         foundAssignableTypes.AddRange(foundTypes);
                     }