lib/PublicInbox/IPC.pm | 3 ++-

diff --git a/lib/PublicInbox/IPC.pm b/lib/PublicInbox/IPC.pm
index add5f3dfd1d4a6377077a5ebbe414ded1f0215c7..1c699d76fea1578558ec5361ae5d8e19913deef7 100644
--- a/lib/PublicInbox/IPC.pm
+++ b/lib/PublicInbox/IPC.pm
@@ -353,7 +353,8 @@ 		$self->{-wq_worker_nr} =
 				keys %{delete($self->{-wq_workers}) // {}};
 		$SIG{$_} = 'IGNORE' for (qw(PIPE));
 		$SIG{$_} = 'DEFAULT' for (qw(TTOU TTIN TERM QUIT INT CHLD));
-		local $0 = "$self->{-wq_ident} $self->{-wq_worker_nr}";
+		local $0 = $one ? $self->{-wq_ident} :
+			"$self->{-wq_ident} $self->{-wq_worker_nr}";
 		# ensure we properly exit even if warn() dies:
 		my $end = PublicInbox::OnDestroy->new($$, sub { exit(!!$@) });
 		eval {