lib/PublicInbox/SolverGit.pm | 2 +-

diff --git a/lib/PublicInbox/SolverGit.pm b/lib/PublicInbox/SolverGit.pm
index a13ae9e51fba3d1ddfa13ced17806eb809234f21..463a9b6906ba069f87a049ea7f4fc40a51334153 100644
--- a/lib/PublicInbox/SolverGit.pm
+++ b/lib/PublicInbox/SolverGit.pm
@@ -558,7 +558,7 @@ 	$self->{psgi_env} = $env;
 	$self->{todo} = [ { %$hints, oid_b => $oid_want } ];
 	$self->{patches} = []; # [ $di, $di, ... ]
 	$self->{found} = {}; # { abbr => [ ::Git, oid, type, size, $di ] }
-	$self->{tmp} = File::Temp->newdir('solver.tmp-XXXXXXXX', TMPDIR => 1);
+	$self->{tmp} = File::Temp->newdir("solver.$oid_want-XXXXXXXX", TMPDIR => 1);
 
 	dbg($self, "solving $oid_want ...");
 	my $step_cb = step_cb($self);