diff --git a/lib/timeout.rb b/lib/timeout.rb
index 753bb91ffd..441f8d4236 100644
--- a/lib/timeout.rb
+++ b/lib/timeout.rb
@@ -26,7 +26,7 @@ module Timeout
   class Error < RuntimeError
   end
   class ExitException < ::Exception # :nodoc:
-    attr_reader :klass, :thread
+    attr_reader :thread
 
     def self.catch
       exc = new