lib/PublicInbox/WatchMaildir.pm | 9 ++++++++-

diff --git a/lib/PublicInbox/WatchMaildir.pm b/lib/PublicInbox/WatchMaildir.pm
index d08f2297af159b9d3b18aa1ab1152bc3d671b965..0b284bdba41bc5dcf0de46e0f8711a3f679ba3ea 100644
--- a/lib/PublicInbox/WatchMaildir.pm
+++ b/lib/PublicInbox/WatchMaildir.pm
@@ -224,7 +224,14 @@ 		my $name = $inbox->{name};
 		my $addr = $inbox->{-primary_address};
 		PublicInbox::Import->new($git, $name, $addr, $inbox);
 	};
-	$self->{importers}->{"$im"} = $im;
+
+	my $importers = $self->{importers};
+	if (scalar(keys(%$importers)) > 2) {
+		delete $importers->{"$im"};
+		_done_for_now($self);
+	}
+
+	$importers->{"$im"} = $im;
 }
 
 sub _scrubber_for {