diff --git a/lib/webrat/rails.rb b/lib/webrat/rails.rb
index 48a008a..3488e41 100644
--- a/lib/webrat/rails.rb
+++ b/lib/webrat/rails.rb
@@ -1,4 +1,5 @@
 require "webrat"
+require "action_controller/integration"
 
 module Webrat
   class RailsSession < Session #:nodoc:
@@ -71,7 +72,7 @@ end
 
 module ActionController #:nodoc:
   module Integration #:nodoc:
-    class Session #:nodoc:
+    Session.class_eval do
       unless instance_methods.include?("put_via_redirect")
         require "webrat/rails/redirect_actions"
         include Webrat::RedirectActions
@@ -79,7 +80,7 @@ module ActionController #:nodoc:
     end
   end
   
-  class IntegrationTest
+  IntegrationTest.class_eval do
     include Webrat::Methods
   end
 end