diff --git a/tests/environment.rb b/tests/environment.rb
index fd4d8d33..9b6a6d4f 100644
--- a/tests/environment.rb
+++ b/tests/environment.rb
@@ -3,6 +3,7 @@ raise 'Forget it.' if ENV['RACK_ENV'] == 'production'
 
 require 'coveralls'
 require 'simplecov'
+require 'mock_redis'
 
 SimpleCov.formatters = [
   SimpleCov::Formatter::HTMLFormatter,