lib/PublicInbox/LeiToMail.pm  | 2 +-
 lib/PublicInbox/MdirReader.pm | 4 ++--

diff --git a/lib/PublicInbox/LeiToMail.pm b/lib/PublicInbox/LeiToMail.pm
index 5cea73e19e78f2bd14f98f491daaa4401825dcb6..6f386b10be73c293bae7ab3b64ee0822eb166433 100644
--- a/lib/PublicInbox/LeiToMail.pm
+++ b/lib/PublicInbox/LeiToMail.pm
@@ -637,7 +637,7 @@ sub poke_dst {
 	my ($self) = @_;
 	if ($self->{base_type} eq 'maildir') {
 		my $t = time + 1;
-		utime($t, $t, "$self->{dst}/cur");
+		utime($t, $t, $self->{dst} . 'cur');
 	}
 }
 
diff --git a/lib/PublicInbox/MdirReader.pm b/lib/PublicInbox/MdirReader.pm
index 06806e80eafc02d636a9ce988076387c03a87112..30e6f8ad6dbc599715694a9dbe5e3989ce164ed4 100644
--- a/lib/PublicInbox/MdirReader.pm
+++ b/lib/PublicInbox/MdirReader.pm
@@ -42,7 +42,7 @@
 sub maildir_each_eml ($$;@) {
 	my ($dir, $cb, @arg) = @_;
 	$dir .= '/' unless substr($dir, -1) eq '/';
-	my $pfx = "$dir/new/";
+	my $pfx = $dir . 'new/';
 	if (opendir(my $dh, $pfx)) {
 		while (defined(my $bn = readdir($dh))) {
 			next if substr($bn, 0, 1) eq '.';
@@ -53,7 +53,7 @@ 			my $eml = eml_from_path($f) or next;
 			$cb->($f, [], $eml, @arg);
 		}
 	}
-	$pfx = "$dir/cur/";
+	$pfx = $dir . 'cur/';
 	opendir my $dh, $pfx or return;
 	while (defined(my $bn = readdir($dh))) {
 		my $fl = maildir_basename_flags($bn) // next;