diff --git a/railties/test/generators_test.rb b/railties/test/generators_test.rb
index 5130b285a9833cda3e88b6674bdd8be241789d87..9241297320d83d37883323ab6293c1540c3dbb19 100644
--- a/railties/test/generators_test.rb
+++ b/railties/test/generators_test.rb
@@ -3,6 +3,7 @@
 require 'rails/generators/test_unit/model/model_generator'
 
 class GeneratorsTest < Rails::Generators::TestCase
+  include ActiveSupport::Testing::Isolation
   include GeneratorsTestHelper
 
   def setup