diff --git a/lib/sinatra/main.rb b/lib/sinatra/main.rb
index 05b307cfd8..98dcedd34a 100644
--- a/lib/sinatra/main.rb
+++ b/lib/sinatra/main.rb
@@ -28,8 +28,3 @@ class Application < Base
 end
 
 include Sinatra::Delegator
-
-def mime(ext, type)
-  ext = ".#{ext}" unless ext.to_s[0] == ?.
-  Rack::Mime::MIME_TYPES[ext.to_s] = type
-end