diff --git a/lib/sitemap_generator/application.rb b/lib/sitemap_generator/application.rb
index 9febc254..388310f9 100644
--- a/lib/sitemap_generator/application.rb
+++ b/lib/sitemap_generator/application.rb
@@ -3,7 +3,7 @@
 module SitemapGenerator
   class Application
     def rails?
-      defined?(Rails)
+      defined?(Rails::Railtie)
     end
 
     # Returns a boolean indicating whether this environment is Rails 3
diff --git a/spec/sitemap_generator/application_spec.rb b/spec/sitemap_generator/application_spec.rb
index 824d8fc6..4c07ab8d 100644
--- a/spec/sitemap_generator/application_spec.rb
+++ b/spec/sitemap_generator/application_spec.rb
@@ -3,7 +3,8 @@
 describe SitemapGenerator::Application do
   before :all do
     SitemapGenerator::Utilities.with_warnings(nil) do
-      Object.const_set(:Rails, Object.new)
+      Object.const_set(:Rails, Object)
+      Object::Rails.const_set(:Railtie, Object)
     end
   end