diff --git a/app/models/customer.rb b/app/models/customer.rb
index e593200..ae3c5a8 100644
--- a/app/models/customer.rb
+++ b/app/models/customer.rb
@@ -122,7 +122,7 @@ class Customer < ActiveRecord::Base
     #where.not(customers.map(&:id)).destroy_all
   end
   
-  def without_callback(*args, &block)
+  def self.without_callback(*args, &block)
     skip_callback(*args)
     yield
     set_callback(*args)