t/spawn.t | 2 +-

diff --git a/t/spawn.t b/t/spawn.t
index fd669e222e1bd7031e1a13cb7ebd23580930a1c1..a0019202a85aaf8da3958c86a94423fe8ce82ab8 100644
--- a/t/spawn.t
+++ b/t/spawn.t
@@ -29,7 +29,7 @@ 	$waited == $pid or die "mismatched child $pid != $waited";
 	$? == 0 or die "child err: $>";
 	$SIG{CHLD} = sub { print "HI\n"; exit };
 	print "RDY $$\n";
-	sleep while 1;
+	select(undef, undef, undef, 0.01) while 1;
 }
 EOF
 	my $oldset = PublicInbox::Sigfd::block_signals();