lib/PublicInbox/LeiXSearch.pm | 1 +

diff --git a/lib/PublicInbox/LeiXSearch.pm b/lib/PublicInbox/LeiXSearch.pm
index 95862306cd7a98beba3aca94659f17bd7bf3460a..5cf02136ba42ae012182e37f64892ce08a2ae26e 100644
--- a/lib/PublicInbox/LeiXSearch.pm
+++ b/lib/PublicInbox/LeiXSearch.pm
@@ -268,6 +268,7 @@ 		seek($cerr, $coff, SEEK_SET) or warn "seek(curl stderr): $!\n";
 		my $e = do { local $/; <$cerr> } //
 				die "read(curl stderr): $!\n";
 		$coff += length($e);
+		truncate($cerr, 0);
 		next if (($? >> 8) == 22 && $e =~ /\b404\b/);
 		$lei->child_error($?);
 		$uri->query_form(q => $lei->{mset_opt}->{qstr});