diff --git a/.gitignore b/.gitignore
index 715d0bc4bc..9480b47d15 100644
--- a/.gitignore
+++ b/.gitignore
@@ -19,3 +19,4 @@ railties/tmp
 bin
 .bundle
 pkg
+*.gem
\ No newline at end of file
diff --git a/activesupport/lib/active_support/core_ext/file/path.rb b/activesupport/lib/active_support/core_ext/file/path.rb
new file mode 100644
index 0000000000..b5feab80ae
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/file/path.rb
@@ -0,0 +1,5 @@
+class File
+  unless File.allocate.respond_to?(:to_path)
+    alias to_path path
+  end
+end
\ No newline at end of file
diff --git a/railties/test/application/middleware_test.rb b/railties/test/application/middleware_test.rb
index ce9cd510a3..5e869bff1e 100644
--- a/railties/test/application/middleware_test.rb
+++ b/railties/test/application/middleware_test.rb
@@ -19,6 +19,7 @@ module ApplicationTests
         "Rack::Runtime",
         "Rails::Rack::Logger",
         "ActionDispatch::ShowExceptions",
+        "Rack::Sendfile",
         "ActionDispatch::Callbacks",
         "ActionDispatch::Cookies",
         "ActionDispatch::Session::CookieStore",