t/watch_maildir.t | 5 ++++-

diff --git a/t/watch_maildir.t b/t/watch_maildir.t
index 213896385d7e59622059dbf8fc88db7d7bdac67d..3969c80d6ce6171720891b02f4fd7f4662302acb 100644
--- a/t/watch_maildir.t
+++ b/t/watch_maildir.t
@@ -94,7 +94,10 @@ 	my $fail_path = "$fail_bin:$ENV{PATH}"; # for spamc ham mock
 	local $ENV{PATH} = $fail_path;
 	PublicInbox::Emergency->new($maildir)->prepare(\$msg);
 	$config->{'publicinboxwatch.spamcheck'} = 'spamc';
-	PublicInbox::WatchMaildir->new($config)->scan;
+	{
+		local $SIG{__WARN__} = sub {}; # quiet spam check warning
+		PublicInbox::WatchMaildir->new($config)->scan;
+	}
 	@list = $git->qx(qw(ls-tree -r --name-only refs/heads/master));
 	is(scalar @list, 0, 'tree has no files spamc checked');
 	is(unlink(glob("$maildir/new/*")), 1);