diff --git a/lib/wicked_pdf.rb b/lib/wicked_pdf.rb
index 9c08a348..dc05576f 100644
--- a/lib/wicked_pdf.rb
+++ b/lib/wicked_pdf.rb
@@ -5,6 +5,7 @@
 require 'digest/md5'
 require 'rbconfig'
 require 'open3'
+require 'ostruct'
 
 require 'active_support/core_ext/module/attribute_accessors'
 require 'active_support/core_ext/object/blank'