--- AnyEvent-Fork-RPC/RPC.pm	2013/04/18 20:04:51	1.17
+++ AnyEvent-Fork-RPC/RPC.pm	2013/04/18 20:20:42	1.18
@@ -565,7 +565,8 @@
 
    my $guard = Guard::guard {
       $shutdown = 1;
-      $ww ||= $fh && AE::io $fh, 1, $wcb;
+
+      $wcb->() if $fh && !$ww;
    };
 
    my $id;