diff --git a/lib/spree/auth/engine.rb b/lib/spree/auth/engine.rb
index 01ed4480..250b3612 100644
--- a/lib/spree/auth/engine.rb
+++ b/lib/spree/auth/engine.rb
@@ -6,6 +6,8 @@
 module Spree
   module Auth
     class Engine < Rails::Engine
+      include Spree::Core::ControllerHelpers::GemChecking
+
       isolate_namespace Spree
       engine_name 'spree_auth'
 
@@ -30,17 +32,17 @@ def self.activate
         Dir.glob(File.join(File.dirname(__FILE__), '../../app/**/*_decorator*.rb')) do |c|
           Rails.configuration.cache_classes ? require(c) : load(c)
         end
-        if Spree::Auth::Engine.backend_available?
+        if backend_available?
           Dir.glob(File.join(File.dirname(__FILE__), "../../controllers/backend/*/*/*_decorator*.rb")) do |c|
             Rails.configuration.cache_classes ? require(c) : load(c)
           end
         end
-        if Spree::Auth::Engine.frontend_available?
+        if frontend_available?
           Dir.glob(File.join(File.dirname(__FILE__), "../../controllers/frontend/**/*_decorator*.rb")) do |c|
             Rails.configuration.cache_classes ? require(c) : load(c)
           end
         end
-        if Spree::Auth::Engine.api_available?
+        if api_available?
           Dir.glob(File.join(File.dirname(__FILE__), "../../controllers/api/**/*_decorator*.rb")) do |c|
             Rails.configuration.cache_classes ? require(c) : load(c)
           end
@@ -48,26 +50,6 @@ def self.activate
         ApplicationController.send :include, Spree::AuthenticationHelpers
       end
 
-      def self.api_available?
-        @@api_available ||= ::Rails::Engine.subclasses.map(&:instance).map{ |e| e.class.to_s }.include?('Spree::Api::Engine')
-      end
-
-      def self.backend_available?
-        @@backend_available ||= ::Rails::Engine.subclasses.map(&:instance).map{ |e| e.class.to_s }.include?('Spree::Backend::Engine')
-      end
-
-      def self.frontend_available?
-        @@frontend_available ||= Gem::Specification.find_all_by_name('spree_frontend').any?
-      end
-
-      def self.api_available?
-        @@api_available ||= ::Rails::Engine.subclasses.map(&:instance).map{ |e| e.class.to_s }.include?('Spree::Api::Engine')
-      end
-
-      def self.emails_available?
-        @@emails_available ||= ::Rails::Engine.subclasses.map(&:instance).map{ |e| e.class.to_s }.include?('Spree::Emails::Engine')
-      end
-
       if backend_available?
         paths["app/controllers"] << "lib/controllers/backend"
         paths["app/views"] << "lib/views/backend"