diff --git a/app/controllers/admin/offers_controller.rb b/app/controllers/admin/offers_controller.rb
index 1eb5ff7..ecce4e3 100755
--- a/app/controllers/admin/offers_controller.rb
+++ b/app/controllers/admin/offers_controller.rb
@@ -119,6 +119,9 @@ class Admin::OffersController < ApplicationController
   end
 
   def download_zip
+
+    require 'zip'
+    
     @offer = Offer.find(params[:id])