lib/PublicInbox/MID.pm | 2 +-

diff --git a/lib/PublicInbox/MID.pm b/lib/PublicInbox/MID.pm
index 8ca3c5797e314e6440aaf36ebc1c1fc4b7134e7c..1b03fdce72e1333132f0884371754b290ac6ed24 100644
--- a/lib/PublicInbox/MID.pm
+++ b/lib/PublicInbox/MID.pm
@@ -39,7 +39,7 @@ 	my ($x2, $x38) = ($mid =~ /\A([a-f0-9]{2})([a-f0-9]{38})\z/);
 
 	unless (defined $x38) {
 		# compatibility with old links (or short Message-IDs :)
-		$mid = sha1_hex($mid);
+		$mid = sha1_hex(mid_clean($mid));
 		($x2, $x38) = ($mid =~ /\A([a-f0-9]{2})([a-f0-9]{38})\z/);
 	}
 	"$x2/$x38";