lib/PublicInbox/Git.pm | 2 +-

diff --git a/lib/PublicInbox/Git.pm b/lib/PublicInbox/Git.pm
index 37342d7d10a473c77498596a2c7a8c8aa3f573e0..e634ca55fd1f75879d6f8dc15126c7444e21cb80 100644
--- a/lib/PublicInbox/Git.pm
+++ b/lib/PublicInbox/Git.pm
@@ -114,7 +114,7 @@ 		}
 		return;
 	}
 	pipe(my ($out_r, $out_w)) or $self->fail("pipe failed: $!");
-	my $rdr = { 0 => $out_r };
+	my $rdr = { 0 => $out_r, pgid => 0 };
 	my $gd = $self->{git_dir};
 	if ($gd =~ s!/([^/]+/[^/]+)\z!/!) {
 		$rdr->{-C} = $gd;