need to require 'stylus/tilt'

README.md

@@ -845,6 +845,8 @@ template than for the layout by passing the `:layout_engine` option.
   </tr>
 </table>
 
+Before being able to use Stylus templates, you need to `require 'stylus/tilt'`.
+
 #### Yajl Templates
 
 <table>

test/stylus_test.rb

@@ -1,7 +1,7 @@
 require File.expand_path('../helper', __FILE__)
 
 begin
-  require 'stylus'
+  require 'stylus/tilt'
 
   begin
     Stylus.compile '1'