diff --git a/config.ru b/config.ru
index f7e5e09..c45449d 100644
--- a/config.ru
+++ b/config.ru
@@ -1,6 +1,7 @@
 # This file is used by Rack-based servers to start the application.
 
 unless defined?(PhusionPassenger)
+  require 'unicorn'
   # Unicorn self-process killer
   require 'unicorn/worker_killer'
 
--
libgit2 0.21.2