diff --git a/lib/princely.rb b/lib/princely.rb
index 8dfdf5b..3d25d42 100644
--- a/lib/princely.rb
+++ b/lib/princely.rb
@@ -17,7 +17,7 @@
 #
 require 'logger'
 require 'pathname'
-require 'princely/rails' if defined?(Rails)
+require 'princely/railtie' if defined?(Rails)
 
 module Princely
   autoload :StdoutLogger, 'princely/stdout_logger'
diff --git a/lib/princely/rails.rb b/lib/princely/rails.rb
deleted file mode 100644
index 48d9b75..0000000
--- a/lib/princely/rails.rb
+++ /dev/null
@@ -1,16 +0,0 @@
-require 'princely/pdf_helper'
-
-if Mime::Type.lookup_by_extension(:pdf) != 'application/pdf'
-  Mime::Type.register 'application/pdf', :pdf
-end
-
-if defined?(Rails)
-  if Rails::VERSION::MAJOR >= 5
-    ActionController::Base.send(:prepend, Princely::PdfHelper)
-  else
-    ActionController::Base.send(:include, Princely::PdfHelper)
-  end
-  ActionController::Base.send(:include, Princely::AssetSupport) if
-   (Rails::VERSION::MAJOR == 3 && Rails::VERSION::MINOR > 0) ||
-   (Rails::VERSION::MAJOR >= 4)
-end
diff --git a/lib/princely/railtie.rb b/lib/princely/railtie.rb
new file mode 100644
index 0000000..93deae6
--- /dev/null
+++ b/lib/princely/railtie.rb
@@ -0,0 +1,27 @@
+require 'princely/pdf_helper'
+
+module Princely
+  class Railtie < Rails::Railtie
+    initializer "princely.helper" do
+      if Mime::Type.lookup_by_extension(:pdf) != 'application/pdf'
+        Mime::Type.register 'application/pdf', :pdf
+      end
+
+      if ::Rails::VERSION::MAJOR >= 5
+        ActiveSupport.on_load(:action_controller) do
+          prepend Princely::PdfHelper
+        end
+      else
+        ActiveSupport.on_load(:action_controller) do
+          include Princely::PdfHelper
+        end
+      end
+      if (::Rails::VERSION::MAJOR == 3 && ::Rails::VERSION::MINOR > 0) ||
+        (::Rails::VERSION::MAJOR >= 4)
+        ActiveSupport.on_load(:action_controller) do
+          include Princely::AssetSupport
+        end
+      end
+    end
+  end
+end