1 files changed, 4 insertions, 2 deletions
diff --git a/railties/lib/rails/application/finisher.rb b/railties/lib/rails/application/finisher.rb
index 0599e988d9..404e3c3e23 100644
--- a/railties/lib/rails/application/finisher.rb
+++ b/railties/lib/rails/application/finisher.rb
@@ -86,8 +86,10 @@ module Rails
       # added in the hook are taken into account.
       initializer :set_clear_dependencies_hook, group: :all do
         callback = lambda do
-          ActiveSupport::DescendantsTracker.clear
-          ActiveSupport::Dependencies.clear
+          ActiveSupport::Dependencies.interlock.attempt_unloading do
+            ActiveSupport::DescendantsTracker.clear
+            ActiveSupport::Dependencies.clear
+          end
         end
 
         if config.reload_classes_only_on_change