diff --git a/factorish.rb b/factorish.rb
index 4bc22c5..60ed89f 100644
--- a/factorish.rb
+++ b/factorish.rb
@@ -1,3 +1,5 @@
+require 'yaml'
+
 FACTORISH_SETTINGS = ENV['FACTORISH_SETTINGS'] || 'factorish.yml'
 
 SETTINGS = YAML.load_file(FACTORISH_SETTINGS)['factorish']