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-rw-r--r--lib/PublicInbox/SearchIdx.pm3
1 files changed, 1 insertions, 2 deletions
diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index d3a7a0c0..4fd493d9 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -1003,8 +1003,7 @@ sub prepare_stack ($$) {
 sub is_ancestor ($$$) {
         my ($git, $cur, $tip) = @_;
         return 0 unless $git->check($cur);
-        my $cmd = [ 'git', "--git-dir=$git->{git_dir}",
-                qw(merge-base --is-ancestor), $cur, $tip ];
+        my $cmd = $git->cmd(qw(merge-base --is-ancestor), $cur, $tip);
         run_wait($cmd) == 0;
 }