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-rw-r--r--lib/PublicInbox/LeiInput.pm2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/PublicInbox/LeiInput.pm b/lib/PublicInbox/LeiInput.pm
index 947a7a79..d003d983 100644
--- a/lib/PublicInbox/LeiInput.pm
+++ b/lib/PublicInbox/LeiInput.pm
@@ -242,7 +242,7 @@ sub input_path_url {
                 }
         } elsif (-d _ && $ifmt eq 'mh') {
                 my $mhr = PublicInbox::MHreader->new($input.'/', $lei->{3});
-                $mhr->{sort} = $lei->{opt}->{sort};
+                $mhr->{sort} = $lei->{opt}->{sort} // [ 'sequence'];
                 $mhr->mh_each_eml($self->can('input_mh_cb'), $self, @args);
         } elsif (-d _ && $ifmt =~ /\A(?:v1|v2)\z/) {
                 my $ibx = PublicInbox::Inbox->new({inboxdir => $input});