diff --git a/app/models/registration.rb b/app/models/registration.rb
index 1198324e..45d2d55b 100644
--- a/app/models/registration.rb
+++ b/app/models/registration.rb
@@ -1,4 +1,5 @@
 class Registration < ApplicationRecord
+  require 'csv'
   belongs_to :user
   belongs_to :conference