diff --git a/app/models/user_preference.rb b/app/models/user_preference.rb
index 836ec6b..55bbb7e 100644
--- a/app/models/user_preference.rb
+++ b/app/models/user_preference.rb
@@ -19,7 +19,7 @@ class UserPreference < ActiveRecord::Base
   belongs_to :user
   serialize :others
 
-  attr_protected :others
+  attr_protected :others, :user_id
 
   before_save :set_others_hash