diff --git a/config.ru b/config.ru
index 4397cef..80e8a7c 100644
--- a/config.ru
+++ b/config.ru
@@ -5,7 +5,7 @@ set :environment, :production
 
 FileUtils.mkdir_p 'log' unless File.exists?('log')
 log = File.new("log/sinatra.log", "a")
-STDOUT.reopen(log)
-STDERR.reopen(log)
+$stdout.reopen(log)
+$stderr.reopen(log)
 
 run Sinatra::Application