diff --git a/code/SubsiteAdmin.php b/code/SubsiteAdmin.php
index 56b30ac..e1ffa29 100644
--- a/code/SubsiteAdmin.php
+++ b/code/SubsiteAdmin.php
@@ -71,7 +71,7 @@ class SubsiteAdmin_CollectionController extends ModelAdmin_CollectionController
 		
 		if(Director::is_ajax()) {
 			$recordController = new ModelAdmin_RecordController($this, $request, $subsite->ID);
-			return new HTTPResponse(
+			return new SS_HTTPResponse(
 				$recordController->EditForm()->forAjaxTemplate(), 
 				200, 
 				sprintf(