diff --git a/lib/audit_rails/engine.rb b/lib/audit_rails/engine.rb
index <HASH>..<HASH> 100644
--- a/lib/audit_rails/engine.rb
+++ b/lib/audit_rails/engine.rb
@@ -1,3 +1,6 @@
+require 'rubygems'
+require 'to_xls'
+
 module AuditRails
   class Engine < ::Rails::Engine
     isolate_namespace AuditRails
Added to_xls to required list