lib/PublicInbox/Git.pm | 2 +-
 t/www_listing.t        | 1 +

diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index 68445b3cc28961379e763908e8b93b9d5f8e061a..82510b99641200bd014ffdc9d6a537ae22775220 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -320,7 +320,7 @@ 	foreach my $oid (<$fh>) {
 		chomp $oid;
 		my $buf = cat_file($self, $oid) or next;
 		$$buf =~ /^committer .*?> ([0-9]+) [\+\-]?[0-9]+/sm or next;
-		my $cmt_time = $1;
+		my $cmt_time = $1 + 0;
 		$modified = $cmt_time if $cmt_time > $modified;
 	}
 	$modified || time;
diff --git a/t/www_listing.t b/t/www_listing.t
index 2741e1b8b531db17084b5c2ed0bb3ff51e5bb8bd..1f2929808f54c21ab1dd73ddda4a7f600608029a 100644
--- a/t/www_listing.t
+++ b/t/www_listing.t
@@ -96,6 +96,7 @@ 		last if $n == 0;
 		$body .= $buf;
 	}
 	IO::Uncompress::Gunzip::gunzip(\$body => \$tmp);
+	unlike($tmp, qr/"modified":\s*"/, 'modified is an integer');
 	my $manifest = $json->decode($tmp);
 	ok(my $clone = $manifest->{'/alt'}, '/alt in manifest');
 	is($clone->{owner}, 'lorelei', 'owner set');