diff --git a/actionpack/lib/action_controller/metal/rack_delegation.rb b/actionpack/lib/action_controller/metal/rack_delegation.rb
index f01f4b99a9..bdf6e88699 100644
--- a/actionpack/lib/action_controller/metal/rack_delegation.rb
+++ b/actionpack/lib/action_controller/metal/rack_delegation.rb
@@ -9,8 +9,7 @@ module ActionController
              :status, :location, :content_type, :to => "@_response"
 
     def dispatch(action, request)
-      @_response         = ActionDispatch::Response.new
-      @_response.request = request
+      set_response!(request)
       super(action, request)
     end
 
@@ -22,5 +21,12 @@ module ActionController
     def reset_session
       @_request.reset_session
     end
+
+    private
+
+    def set_response!(request)
+      @_response         = ActionDispatch::Response.new
+      @_response.request = request
+    end
   end
 end