diff --git a/code/CMSProfileController.php b/code/CMSProfileController.php
index ea179c638..d271804d1 100644
--- a/code/CMSProfileController.php
+++ b/code/CMSProfileController.php
@@ -20,6 +20,9 @@ class CMSProfileController extends LeftAndMain
 
     private static $required_permission_codes = 'CMS_ACCESS';
 
+    /**
+     * @deprecated 5.4.0 Will be renamed to model_class
+     */
     private static $tree_class = Member::class;
 
     private static $ignore_menuitem = true;
diff --git a/code/LeftAndMain.php b/code/LeftAndMain.php
index d502509fe..76d5558aa 100644
--- a/code/LeftAndMain.php
+++ b/code/LeftAndMain.php
@@ -98,6 +98,7 @@ class LeftAndMain extends AdminController implements PermissionProvider
      *
      * @config
      * @var string
+     * @deprecated 5.4.0 Will be renamed to model_class
      */
     private static $tree_class = null;
 
diff --git a/code/SecurityAdmin.php b/code/SecurityAdmin.php
index b817ae5c8..c17d42ac8 100755
--- a/code/SecurityAdmin.php
+++ b/code/SecurityAdmin.php
@@ -58,6 +58,9 @@ class SecurityAdmin extends ModelAdmin implements PermissionProvider
 
     private static $menu_priority = 0;
 
+    /**
+     * @deprecated 5.4.0 Will be renamed to model_class
+     */
     private static $tree_class = Group::class;
 
     private static $required_permission_codes = 'CMS_ACCESS_SecurityAdmin';