t/sigfd.t | 3 ++-

diff --git a/t/sigfd.t b/t/sigfd.t
index bb854147023d8eb522c2a0ddbe5d88ab6032d7aa..a1ab222c0c4daeaeb5ead02f8f2f35ad820782c9 100644
--- a/t/sigfd.t
+++ b/t/sigfd.t
@@ -47,7 +47,8 @@ 		ok($! == Errno::EAGAIN, 'got EAGAIN');
 		kill('HUP', $$) or die "kill $!";
 		PublicInbox::DS->SetPostLoopCallback(sub {}); # loop once
 		PublicInbox::DS->EventLoop;
-		is($hit->{HUP}->{sigfd}, 2, 'HUP sigfd fired in event loop');
+		is($hit->{HUP}->{sigfd}, 2, 'HUP sigfd fired in event loop') or
+			diag explain($hit); # sometimes fails on FreeBSD 11.x
 		kill('TERM', $$) or die "kill $!";
 		kill('HUP', $$) or die "kill $!";
 		PublicInbox::DS->EventLoop;