lib/PublicInbox/View.pm | 4 ++--

diff --git a/lib/PublicInbox/View.pm b/lib/PublicInbox/View.pm
index ed3c96e80d6ec5297abbae0d1c523e515a42963d..373545a2fadc181607d9946d9a5c10725f4e038c 100644
--- a/lib/PublicInbox/View.pm
+++ b/lib/PublicInbox/View.pm
@@ -208,8 +208,8 @@ 	my $nr_c = scalar @{$map->[0]};
 	my $nr_s = 0;
 	my $level = $map->[4];
 	my $idx = $map->[3];
-	if (defined $irt) {
-		my $irt_map = $mapping->{$irt};
+	my $irt_map = $mapping->{$irt} if defined $irt;
+	if (defined $irt_map) {
 		my $siblings = $irt_map->[0];
 		$nr_s = scalar(@$siblings) - 1;
 		$rv .= $pad . $irt_map->[1];