diff --git a/lib/capybara/rails.rb b/lib/capybara/rails.rb
index 03ecd60e2..c2a48c067 100644
--- a/lib/capybara/rails.rb
+++ b/lib/capybara/rails.rb
@@ -3,7 +3,7 @@
 
 Capybara.app = Rack::Builder.new do
   map "/" do
-    if Rails.version.to_f >= 3.0
+    if Rails.version.to_s >= "3.0"
       run Rails.application
     else # Rails 2
       use Rails::Rack::Static