lib/PublicInbox/LeiTag.pm | 6 +++++-
 t/lei-import-imap.t       | 1 +

diff --git a/lib/PublicInbox/LeiTag.pm b/lib/PublicInbox/LeiTag.pm
index d572a84acab43e84ece12d90ff32e9fd82e5692b..06313139775446ca592ffbeeab380f16b57650b6 100644
--- a/lib/PublicInbox/LeiTag.pm
+++ b/lib/PublicInbox/LeiTag.pm
@@ -112,7 +112,8 @@ 		return $lei->fail('no keywords or labels specified');
 	my $ops = { '' => [ \&tag_done, $lei ] };
 	$lei->{auth}->op_merge($ops, $self) if $lei->{auth};
 	$self->{vmd_mod} = $vmd_mod;
-	(my $op_c, $ops) = $lei->workers_start($self, 'lei_tag', 1, $ops);
+	my $j = $self->{-wq_nr_workers} = 1; # locked for now
+	(my $op_c, $ops) = $lei->workers_start($self, 'lei_tag', $j, $ops);
 	$lei->{tag} = $self;
 	net_merge_complete($self) unless $lei->{auth};
 	$op_c->op_wait_event($ops);
@@ -174,5 +175,8 @@ 		# don't duplicate if already 100% completed
 		/\A$re(\Q$cur\E.*)/ ? ($cur eq $1 ? () : $1) : ();
 	} grep(/$re\Q$cur/, @all);
 }
+
+no warnings 'once'; # the following works even when LeiAuth is lazy-loaded
+*net_merge_all = \&PublicInbox::LeiAuth::net_merge_all;
 
 1;
diff --git a/t/lei-import-imap.t b/t/lei-import-imap.t
index fd38037ae9c1654b47af76759df442e3559a05df..7e4d44b9d246f14dc3267cf53851002c5eaf9db8 100644
--- a/t/lei-import-imap.t
+++ b/t/lei-import-imap.t
@@ -23,5 +23,6 @@ 	is(pop @$out, undef, 'trailing JSON null element was null');
 	my %r;
 	for (@$out) { $r{ref($_)}++ }
 	is_deeply(\%r, { 'HASH' => scalar(@$out) }, 'all hashes');
+	lei_ok([qw(tag +kw:seen), "imap://$host_port/t.v2.0"], undef, undef);
 });
 done_testing;