config/routes.rb in ahoy_email-0.3.0 vs config/routes.rb in ahoy_email-0.3.1

@@ -1,6 +1,8 @@
 Rails.application.routes.draw do
-  mount AhoyEmail::Engine => "/ahoy"
+  unless respond_to?(:has_named_route?) && has_named_route?("ahoy_email_engine")
+    mount AhoyEmail::Engine => "/ahoy"
+  end
 end
 
 AhoyEmail::Engine.routes.draw do
   scope module: "ahoy" do
     resources :messages, only: [] do