diff --git a/tdiary/application.rb b/tdiary/application.rb
index f6ae1fb24..34b304533 100644
--- a/tdiary/application.rb
+++ b/tdiary/application.rb
@@ -7,7 +7,7 @@
 module TDiary
 	class Application
 		def initialize( base_dir = '' )
-			@app = ::Rack::Builder.new {
+			@app = ::Rack::Builder.app {
 				map "#{base_dir}/" do
 					use TDiary::Rack::HtmlAnchor
 					run ::Rack::Cascade.new([