diff --git a/code/Controller/AssetAdmin.php b/code/Controller/AssetAdmin.php
index 3e92dc32b..618c3139f 100644
--- a/code/Controller/AssetAdmin.php
+++ b/code/Controller/AssetAdmin.php
@@ -62,7 +62,7 @@ class AssetAdmin extends AssetAdminOpen implements PermissionProvider
 
     private static $menu_icon_class = 'font-icon-image';
 
-    private static $tree_class = Folder::class;
+    private static $model_class = Folder::class;
 
     private static $url_handlers = [
         // Legacy redirect for SS3-style detail view
diff --git a/code/Controller/AssetAdminOpen.php b/code/Controller/AssetAdminOpen.php
index 54522e29f..d17ebcfb7 100644
--- a/code/Controller/AssetAdminOpen.php
+++ b/code/Controller/AssetAdminOpen.php
@@ -37,7 +37,7 @@ class AssetAdminOpen extends LeftAndMain
 
     private static string $menu_icon_class = 'font-icon-image';
 
-    private static string $tree_class = Folder::class;
+    private static string $model_class = Folder::class;
 
     private static array $url_handlers = [
         'GET api/read/$ID!' => 'apiRead',