1 files changed, 2 insertions, 0 deletions
diff --git a/railties/lib/rails/application/bootstrap.rb b/railties/lib/rails/application/bootstrap.rb
index 0a435f0f36..44e26b5713 100644
--- a/railties/lib/rails/application/bootstrap.rb
+++ b/railties/lib/rails/application/bootstrap.rb
@@ -1,4 +1,5 @@
 require "active_support/notifications"
+require "active_support/descendants_tracker"
 
 module Rails
   class Application
@@ -55,6 +56,7 @@ module Rails
       initializer :set_clear_dependencies_hook do
         unless config.cache_classes
           ActionDispatch::Callbacks.after do
+            ActiveSupport::DescendantsTracker.clear
             ActiveSupport::Dependencies.clear
           end
         end