lib/PublicInbox/NNTP.pm | 2 +-

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 90a5a3a58e686b35eb1367e9accc95d1c9fc1b6f..623ffd35c172ba85d7204570be33b6b563bf501b 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -902,7 +902,7 @@
 sub do_write ($$) {
 	my ($self, $data) = @_;
 	my $done = $self->write($data);
-	return if $self->{closed};
+	return 0 if $self->{closed};
 
 	# Do not watch for readability if we have data in the queue,
 	# instead re-enable watching for readability when we can