diff --git a/lib/kirk/client/exchange.rb b/lib/kirk/client/exchange.rb
index e0f8733..a800e64 100644
--- a/lib/kirk/client/exchange.rb
+++ b/lib/kirk/client/exchange.rb
@@ -1,8 +1,6 @@
 module Kirk
   class Client
     class Exchange < Jetty::ContentExchange
-      include java.util.concurrent.Callable
-
       def initialize(session, handler)
         @handler = handler
         @session = session