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

diff --git a/lib/PublicInbox/ViewDiff.pm b/lib/PublicInbox/ViewDiff.pm
index 6fe9a0d7610e5a345ede4c74abd362514502ce61..536bb9e3c99e458e486e96f0abdb2fa9eca83637 100644
--- a/lib/PublicInbox/ViewDiff.pm
+++ b/lib/PublicInbox/ViewDiff.pm
@@ -50,12 +50,12 @@ 	my ($oid_a, $oid_b, $spfx) = @$dctx{qw(oid_a oid_b spfx)};
 
 	if (defined($spfx) && defined($oid_a) && defined($oid_b)) {
 		my ($n) = ($ca =~ /^-([0-9]+)/);
-		$n = defined($n) ? do { ++$n; "#n$n" } : '';
+		$n = defined($n) ? "#n$n" : '';
 
 		$$dst .= qq(@@ <a\nhref="$spfx$oid_a/s/$dctx->{Q}$n">$ca</a>);
 
 		($n) = ($cb =~ /^\+([0-9]+)/);
-		$n = defined($n) ? do { ++$n; "#n$n" } : '';
+		$n = defined($n) ? "#n$n" : '';
 		$$dst .= qq( <a\nhref="$spfx$oid_b/s/$dctx->{Q}$n">$cb</a> @@);
 	} else {
 		$$dst .= "@@ $ca $cb @@";