lib/PublicInbox/InboxWritable.pm | 1 +

diff --git a/lib/PublicInbox/InboxWritable.pm b/lib/PublicInbox/InboxWritable.pm
index d4a9040f14358839ec7400b9d1c05244f3a32778..c2baeba666904ce128435ef36b4e3642cf2f001d 100644
--- a/lib/PublicInbox/InboxWritable.pm
+++ b/lib/PublicInbox/InboxWritable.pm
@@ -153,6 +153,7 @@ 		-d "$dir/$sub" or die "$dir is not a Maildir (missing $sub)\n";
 	}
 	my $im = $self->importer(1);
 	my @self = $self->filter($im) ? ($self) : ();
+	require PublicInbox::MdirReader;
 	PublicInbox::MdirReader::maildir_each_file(\&_each_maildir_fn,
 						$im, @self);
 	$im->done;