diff --git a/test/active_record/models/user.rb b/test/active_record/models/user.rb
index 05b0c888d..70b7d28ad 100644
--- a/test/active_record/models/user.rb
+++ b/test/active_record/models/user.rb
@@ -18,6 +18,7 @@ class User2 < User; end
 end
 
 class UserForm
+  include ActiveModel::Validations
   include ActiveRecord::Validations
 
   attr_accessor :name