diff --git a/test/test_helper.rb b/test/test_helper.rb
index dd200611..a7c59f9f 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -23,6 +23,10 @@ OmniAuth.config.logger = Logger.new('/dev/null')
 $:.unshift File.expand_path('../support', __FILE__)
 Dir["#{File.dirname(__FILE__)}/support/**/*.rb"].each { |f| require f }
 
+# Devise test suite is order dependent, and we need to ensure that same order
+# in Rails 4.2.0.
+ActiveSupport::TestCase.my_tests_are_order_dependent!
+
 # For generators
 require "rails/generators/test_case"
 require "generators/devise/install_generator"