diff --git a/History.txt b/History.txt
index de7cf54..00d632f 100644
--- a/History.txt
+++ b/History.txt
@@ -2,6 +2,7 @@
 
 * Minor enhancements
 
+  * When using Rails 2.3, use Rack::Utils to parse params (Matthew Ford)
   * Initial Merb and Sinatra compatibility for Selenium mode (Corey Donohoe)
   * Add application_framework config for Selenium mode to determine how to
     start and stop the app server (Corey Donohoe)
diff --git a/lib/webrat/core/elements/field.rb b/lib/webrat/core/elements/field.rb
index ef3fd2b..fc3f9ec 100644
--- a/lib/webrat/core/elements/field.rb
+++ b/lib/webrat/core/elements/field.rb
@@ -80,7 +80,7 @@ module Webrat
       
       case Webrat.configuration.mode
       when :rails
-        rails_request_parser.parse_query_parameters("#{name}=#{escaped_value}")
+        parse_rails_request_params("#{name}=#{escaped_value}")
       when :merb
         ::Merb::Parse.query("#{name}=#{escaped_value}")
       else
@@ -98,12 +98,15 @@ module Webrat
     
   protected
   
-    def rails_request_parser
+    def parse_rails_request_params(params)
       if defined?(ActionController::AbstractRequest)
-        ActionController::AbstractRequest
-      else
+        ActionController::AbstractRequest.parse_query_parameters(params)
+      elsif defined?(ActionController::UrlEncodedPairParser)
         # For Rails > 2.2
-        ActionController::UrlEncodedPairParser
+        ActionController::UrlEncodedPairParser.parse_query_parameters(params)
+      else
+        # For Rails > 2.3
+        Rack::Utils.parse_nested_query(params)
       end
     end