diff --git a/lib/http/cookie.rb b/lib/http/cookie.rb
index 550042d..e2173e4 100644
--- a/lib/http/cookie.rb
+++ b/lib/http/cookie.rb
@@ -1,5 +1,6 @@
 require 'http/cookie/version'
 require 'time'
+require 'uri'
 require 'webrick/httputils'
 require 'domain_name'