diff --git a/lib/rakuten_web_service/client.rb b/lib/rakuten_web_service/client.rb
index f3805e5..705d2d5 100644
--- a/lib/rakuten_web_service/client.rb
+++ b/lib/rakuten_web_service/client.rb
@@ -1,4 +1,5 @@
 require 'uri'
+require 'net/http'
 require 'cgi'
 require 'json'
 require 'rakuten_web_service/response'