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

diff --git a/lib/PublicInbox/SearchIdx.pm b/lib/PublicInbox/SearchIdx.pm
index 06d1a9f580dfe35b436d39ae8327e211f9f110c1..662055c6595fcbcdb156253356612ee6e4a353fc 100644
--- a/lib/PublicInbox/SearchIdx.pm
+++ b/lib/PublicInbox/SearchIdx.pm
@@ -554,8 +554,8 @@ 		$nr += scalar @removed;
 		$tmp{$_}++ for @removed;
 	}
 	if (!$nr) {
-		$mids = join('> <', @$mids);
-		warn "W: <$mids> missing for removal from overview\n";
+		my $m = join('> <', @$mids);
+		warn "W: <$m> missing for removal from overview\n";
 	}
 	while (my ($num, $nr) = each %tmp) {
 		warn "BUG: $num appears >1 times ($nr) for $oid\n" if $nr != 1;