lib/PublicInbox/Mbox.pm | 2 +-

diff --git a/lib/PublicInbox/Mbox.pm b/lib/PublicInbox/Mbox.pm
index d5beceaf65e18b650e147dfef5ed213e8f1a5270..16de1a728ab6345f58c0637f537bfca6485a44ce 100644
--- a/lib/PublicInbox/Mbox.pm
+++ b/lib/PublicInbox/Mbox.pm
@@ -106,7 +106,7 @@ 		'List-Archive', "<$base>",
 		'List-Post', "<mailto:$ibx->{-primary_address}>",
 	);
 	my $crlf = $header_obj->crlf;
-	my $buf = "From mboxrd\@z Thu Jan  1 00:00:00 1970\n" .
+	my $buf = 'From mboxrd@z Thu Jan  1 00:00:00 1970' . $crlf .
 			$header_obj->as_string;
 	for (my $i = 0; $i < @append; $i += 2) {
 		my $k = $append[$i];