lib/PublicInbox/ViewVCS.pm | 1 +

diff --git a/lib/PublicInbox/ViewVCS.pm b/lib/PublicInbox/ViewVCS.pm
index 962dc66baccd708ca34666939a6ad306c5ad78a4..60a62e577ab731050dfbcabcdae6c17cda093bb0 100644
--- a/lib/PublicInbox/ViewVCS.pm
+++ b/lib/PublicInbox/ViewVCS.pm
@@ -48,6 +48,7 @@ 	my $cmd = ['git', "--git-dir=$git->{git_dir}", 'cat-file', $type, $oid];
 	my $qsp = PublicInbox::Qspawn->new($cmd);
 	my @cl = ('Content-Length', $size);
 	my $env = $ctx->{env};
+	$env->{'public-inbox.tmpgit'} = $git; # for {-tmp}/File::Temp::Dir
 	$env->{'qspawn.wcb'} = delete $ctx->{-wcb};
 	$qsp->psgi_return($env, undef, sub {
 		my ($r, $bref) = @_;