lib/PublicInbox/Git.pm  | 2 +-
 lib/PublicInbox/HTTP.pm | 2 +-

diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index 6a527f82f9145ada72a1abbf053bf1987009283d..2aaf1866b5965169e4abcec87f1fdaed9b6fb47c 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -300,7 +300,7 @@ sub host_prefix_url ($$) {
 	my ($env, $url) = @_;
 	return $url if index($url, '//') >= 0;
 	my $scheme = $env->{'psgi.url_scheme'};
-	my $host_port = $env->{HTTP_HOST} ||
+	my $host_port = $env->{HTTP_HOST} //
 		"$env->{SERVER_NAME}:$env->{SERVER_PORT}";
 	"$scheme://$host_port". ($env->{SCRIPT_NAME} || '/') . $url;
 }
diff --git a/lib/PublicInbox/HTTP.pm b/lib/PublicInbox/HTTP.pm
index a6ec1d0d7388540e2ace1a90ae16751f641297aa..071251c632e394302097538bf86ed881473a6fe5 100644
--- a/lib/PublicInbox/HTTP.pm
+++ b/lib/PublicInbox/HTTP.pm
@@ -155,7 +155,7 @@ 	$self->rbuf_idle($rbuf);
 	my $env = $self->{env};
 	$env->{REMOTE_ADDR} = $self->{remote_addr};
 	$env->{REMOTE_PORT} = $self->{remote_port};
-	if (my $host = $env->{HTTP_HOST}) {
+	if (defined(my $host = $env->{HTTP_HOST})) {
 		$host =~ s/:([0-9]+)\z// and $env->{SERVER_PORT} = $1;
 		$env->{SERVER_NAME} = $host;
 	}