diff --git a/lib/mail_catcher/web.rb b/lib/mail_catcher/web.rb
index 64fb513..d84bd91 100644
--- a/lib/mail_catcher/web.rb
+++ b/lib/mail_catcher/web.rb
@@ -10,7 +10,7 @@ class Sinatra::Request
 end
 
 class MailCatcher::Web < Sinatra::Base
-  set :root, Pathname.new(__FILE__).dirname.parent.parent
+  set :root, File.expand_path("#{__FILE__}/../../..")
   set :haml, :format => :html5
 
   get '/' do