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

diff --git a/lib/PublicInbox/ExtMsg.pm b/lib/PublicInbox/ExtMsg.pm
index 09ee8d6e3bf98db16874e27c5bf7fee1a310b69d..912a675d1ddc5c66c163e4a682a7fbc3c752fb64 100644
--- a/lib/PublicInbox/ExtMsg.pm
+++ b/lib/PublicInbox/ExtMsg.pm
@@ -138,8 +138,8 @@ 	if (@EXT_URL && index($mid, '@') >= 0) {
 		$code = 300;
 		$s .= "\nPerhaps try an external site:\n\n";
 		my $env = $cgi->{env};
-		foreach my $u (@EXT_URL) {
-			$u = PublicInbox::Hval::prurl($env, $u);
+		foreach my $url (@EXT_URL) {
+			my $u = PublicInbox::Hval::prurl($env, $url);
 			my $r = sprintf($u, $href);
 			my $t = sprintf($u, $html);
 			$s .= qq{<a\nhref="$r">$t</a>\n};