diff --git a/lib/sinatra/test.rb b/lib/sinatra/test.rb
index 6939028a..6954eb59 100644
--- a/lib/sinatra/test.rb
+++ b/lib/sinatra/test.rb
@@ -1,5 +1,7 @@
 require 'sinatra/base'
 
+warn 'Sinatra::Test is deprecated; use Rack::Test instead.'
+
 module Sinatra
   module Test
     include Rack::Utils