diff --git a/Gemfile b/Gemfile
index ff56dab..9c2b8e5 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,11 +8,11 @@ gem 'guard'
 gem 'guard-rspec'
 
 require 'rbconfig'
-if Config::CONFIG['target_os'] =~ /darwin/i
+if RbConfig::CONFIG['target_os'] =~ /darwin/i
   gem 'rb-fsevent', '>= 0.3.9'
   gem 'growl', '~> 1.0.3'
 end
-if Config::CONFIG['target_os'] =~ /linux/i
+if RbConfig::CONFIG['target_os'] =~ /linux/i
   gem 'rb-inotify', '>= 0.5.1'
   gem 'libnotify', '~> 0.1.3'
 end