diff --git a/admin/app/controllers/solidus_admin/authentication_adapters/backend.rb b/admin/app/controllers/solidus_admin/authentication_adapters/backend.rb
index 02234657433..89a9f342c18 100644
--- a/admin/app/controllers/solidus_admin/authentication_adapters/backend.rb
+++ b/admin/app/controllers/solidus_admin/authentication_adapters/backend.rb
@@ -13,7 +13,7 @@ module SolidusAdmin::AuthenticationAdapters::Backend
   def authenticate_solidus_backend_user!
     return if spree_current_user
 
-    instance_exec(&Spree::Admin::BaseController.unauthorized_redirect)
+    Spree::Backend::Config.unauthorized_redirect_handler_class.new(self).call
   end
 
   def store_location