diff --git a/Gemfile b/Gemfile
index 6ce41d415..8a30e19a0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -37,6 +37,7 @@ end
 # Include database gems for the adapters found in the database
 # configuration file
 require 'erb'
+require 'yaml'
 database_file = File.join(File.dirname(__FILE__), "config/database.yml")
 if File.exist?(database_file)
   database_config = YAML::load(ERB.new(IO.read(database_file)).result)