diff --git a/src/common/libremoteio.h b/src/common/libremoteio.h
--- a/src/common/libremoteio.h
+++ b/src/common/libremoteio.h
@@ -90,6 +90,8 @@ struct remoteio
   remoteio_read_handle_func_t read_handler;
   /* for the read_handler */
   void *read_handler_data;
+  /* so that read_handler_data can be cleaned up */
+  remoteio_close_handle_func_t close_handler;
 
   /**
    * Store a buffer of data waiting to be processed.