1 files changed, 2 insertions, 1 deletions
diff --git a/webserver b/webserver
index 90be70c..5371163 100755
--- a/webserver
+++ b/webserver
@@ -19,6 +19,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #----------------------------------------------------------------------
 
+use v5.14.2;
 use strict;
 use warnings;
 
@@ -43,7 +44,7 @@ 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: $!";