diff --git a/lib/sinatra/cross_origin.rb b/lib/sinatra/cross_origin.rb
index 072e182..cf1e697 100644
--- a/lib/sinatra/cross_origin.rb
+++ b/lib/sinatra/cross_origin.rb
@@ -79,4 +79,6 @@ def self.registered(app)
 
     end
   end
+
+  register CrossOrigin
 end