1 files changed, 1 insertions, 1 deletions
diff --git a/webserver b/webserver
index 90be70c..dad3d9d 100755
--- a/webserver
+++ b/webserver
@@ -43,7 +43,7 @@ use Socket qw/AF_UNIX AF_INET AF_INET6/;
 
 # Untaint and fdopen(3) the listening socket
 (shift @ARGV // die) =~ /\A(\d+)\z/ or die;
-open my $S, '+<&=', $1 or die "fdopen $1: $!";
+open (my $S, '+<&=', $1+0) or die "fdopen $1: $!";
 my $ROOT = '/.well-known/acme-challenge';
 
 close STDIN  or die "close: $!";