diff --git a/activesupport/test/subscriber_test.rb b/activesupport/test/subscriber_test.rb
index 8be8c51f07..21e4ba0cee 100644
--- a/activesupport/test/subscriber_test.rb
+++ b/activesupport/test/subscriber_test.rb
@@ -23,6 +23,7 @@ end
 
 # Monkey patch subscriber to test that only one subscriber per method is added.
 class TestSubscriber
+  remove_method :open_party
   def open_party(event)
     events << event
   end