diff --git a/app/services/hyrax/curation_concern.rb b/app/services/hyrax/curation_concern.rb
index f77efe3da2..8a7f1d9163 100644
--- a/app/services/hyrax/curation_concern.rb
+++ b/app/services/hyrax/curation_concern.rb
@@ -15,8 +15,10 @@ class CurationConcern
     #
     # You can customize the actor stack, so long as you do so before the actor
     # is used.  Once it is used, it becomes immutable.
-    # This attribute is set by Hyrax::Engine
-    class_attribute :actor_factory
+    # @return [ActionDispatch::MiddlewareStack]
+    def self.actor_factory
+      Hyrax::DefaultMiddlewareStack.build_stack
+    end
 
     # A consumer of this method can inject a different factory
     # into this class in order to change the behavior of this method.
diff --git a/lib/hyrax/engine.rb b/lib/hyrax/engine.rb
index c1a12c4350..d805fc5bf8 100644
--- a/lib/hyrax/engine.rb
+++ b/lib/hyrax/engine.rb
@@ -37,10 +37,6 @@ class Engine < ::Rails::Engine
       end
     end
 
-    config.to_prepare do
-      Hyrax::CurationConcern.actor_factory = Hyrax::DefaultMiddlewareStack.build_stack
-    end
-
     initializer 'requires' do
       require 'hydra/derivatives'
       require 'hyrax/controller_resource'