lib/PublicInbox/Msgmap.pm | 2 +-

diff --git a/lib/PublicInbox/Msgmap.pm b/lib/PublicInbox/Msgmap.pm
index 192e311aec2b1d459407e0853cfcecb26c2f0448..fdc71e46e214db9526406cf6a6cc76a6686667cf 100644
--- a/lib/PublicInbox/Msgmap.pm
+++ b/lib/PublicInbox/Msgmap.pm
@@ -199,7 +199,7 @@ 	my $dbh = $self->{dbh};
 	my $attr = { Columns => [] };
 	my $mids = $dbh->selectall_arrayref(<<'', $attr, $$beg, $end);
 SELECT num,mid FROM msgmap WHERE num >= ? AND num <= ?
-ORDER BY num ASC
+ORDER BY num ASC LIMIT 1000
 
 	$$beg = $mids->[-1]->[0] + 1 if @$mids;
 	$mids