--- Backend.pm,old	2008-02-01 11:52:22.000000000 -0800
+++ Backend.pm	2008-02-01 11:53:04.000000000 -0800
@@ -97,7 +97,7 @@
 
 sub _wait_for_readability {
     my ($fileno, $timeout) = @_;
-    return 0 unless $fileno && $timeout;
+    return 0 unless defined($fileno) && $timeout;
 
     my $rin = '';
     vec($rin, $fileno, 1) = 1;