diff --git a/src/Umbraco.Web/Editors/ContentTypeController.cs b/src/Umbraco.Web/Editors/ContentTypeController.cs
index 15b80eaa75..aac243f727 100644
--- a/src/Umbraco.Web/Editors/ContentTypeController.cs
+++ b/src/Umbraco.Web/Editors/ContentTypeController.cs
@@ -151,7 +151,7 @@ namespace Umbraco.Web.Editors
 
         public ContentTypeDisplay PostSave(ContentTypeSave contentTypeSave)
         {
-            var savedCt = PerformPostSave(
+            var savedCt = PerformPostSave<IContentType, ContentTypeDisplay>(
                 contentTypeSave:    contentTypeSave,
                 getContentType:     i => Services.ContentTypeService.GetContentType(i),
                 saveContentType:    type => Services.ContentTypeService.Save(type),
diff --git a/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs b/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs
index 7ad770a045..6f3f96d365 100644
--- a/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs
+++ b/src/Umbraco.Web/Editors/ContentTypeControllerBase.cs
@@ -126,13 +126,14 @@ namespace Umbraco.Web.Editors
             return CultureDictionary[text].IfNullOrWhiteSpace(text);
         }
 
-        protected TContentType PerformPostSave<TContentType>(
+        protected TContentType PerformPostSave<TContentType, TContentTypeDisplay>(
             ContentTypeSave contentTypeSave,
             Func<int, TContentType> getContentType,
             Action<TContentType> saveContentType,
             bool validateComposition = true,
             Action<ContentTypeSave> beforeCreateNew = null)
             where TContentType : IContentTypeComposition
+            where TContentTypeDisplay : ContentTypeCompositionDisplay
         {
             var ctId = Convert.ToInt32(contentTypeSave.Id);
             
@@ -140,7 +141,7 @@ namespace Umbraco.Web.Editors
             {
                 var ct = getContentType(ctId);
                 //Required data is invalid so we cannot continue
-                var forDisplay = Mapper.Map<ContentTypeCompositionDisplay>(ct);
+                var forDisplay = Mapper.Map<TContentTypeDisplay>(ct);
                 //map the 'save' data on top
                 forDisplay = Mapper.Map(contentTypeSave, forDisplay);
                 forDisplay.Errors = ModelState.ToErrorDictionary();
diff --git a/src/Umbraco.Web/Editors/MediaTypeController.cs b/src/Umbraco.Web/Editors/MediaTypeController.cs
index 06bbecf0cb..4b1da89713 100644
--- a/src/Umbraco.Web/Editors/MediaTypeController.cs
+++ b/src/Umbraco.Web/Editors/MediaTypeController.cs
@@ -104,7 +104,7 @@ namespace Umbraco.Web.Editors
 
         public ContentTypeCompositionDisplay PostSave(ContentTypeSave contentTypeSave)
         {
-            var savedCt = PerformPostSave(
+            var savedCt = PerformPostSave<IMediaType, ContentTypeCompositionDisplay>(
                 contentTypeSave:    contentTypeSave,
                 getContentType:     i => Services.ContentTypeService.GetMediaType(i),
                 saveContentType:    type => Services.ContentTypeService.Save(type));
diff --git a/src/Umbraco.Web/Editors/MemberTypeController.cs b/src/Umbraco.Web/Editors/MemberTypeController.cs
index fa9b678340..19a89cd963 100644
--- a/src/Umbraco.Web/Editors/MemberTypeController.cs
+++ b/src/Umbraco.Web/Editors/MemberTypeController.cs
@@ -104,7 +104,7 @@ namespace Umbraco.Web.Editors
 
         public ContentTypeCompositionDisplay PostSave(ContentTypeSave contentTypeSave)
         {
-            var savedCt = PerformPostSave(
+            var savedCt = PerformPostSave<IMemberType, ContentTypeCompositionDisplay>(
                 contentTypeSave:        contentTypeSave,
                 getContentType:         i => Services.MemberTypeService.Get(i),
                 saveContentType:        type => Services.MemberTypeService.Save(type),