diff --git a/src/Umbraco.Core/Persistence/Mappers/MapperCollectionBuilder.cs b/src/Umbraco.Core/Persistence/Mappers/MapperCollectionBuilder.cs
index 951b0cdf93..2937d969c7 100644
--- a/src/Umbraco.Core/Persistence/Mappers/MapperCollectionBuilder.cs
+++ b/src/Umbraco.Core/Persistence/Mappers/MapperCollectionBuilder.cs
@@ -35,7 +35,6 @@ namespace Umbraco.Core.Persistence.Mappers
             Add<AuditItemMapper>();
             Add<ContentMapper>();
             Add<ContentTypeMapper>();
-            Add<SimpleContentTypeMapper>();
             Add<DataTypeMapper>();
             Add<DictionaryMapper>();
             Add<DictionaryTranslationMapper>();