diff --git a/config.ru b/config.ru
index f6310009d..7624ce29c 100644
--- a/config.ru
+++ b/config.ru
@@ -2,7 +2,7 @@
 
 require ::File.expand_path('../config/environment',  __FILE__)
 
-if defined? Unicorn
+if defined?(Unicorn) && Rails.env.production?
   require_dependency 'gctools/oobgc'
   use GC::OOB::UnicornMiddleware
 end