diff --git a/lib/screencap.rb b/lib/screencap.rb
index 17d6ad5..7cc472e 100644
--- a/lib/screencap.rb
+++ b/lib/screencap.rb
@@ -2,6 +2,7 @@
 require 'phantomjs.rb'
 
 require 'pathname'
+require 'cgi'
 
 module Screencap
   SCREENCAP_ROOT = Pathname.new(File.dirname(__FILE__))