t/mda_filter_rubylang.t | 1 +

diff --git a/t/mda_filter_rubylang.t b/t/mda_filter_rubylang.t
index 0fb65a42935bb26aafb4df84814fdbed3003e0a6..583a139f3b342ee7a6b55d85ae95c3563c327313 100644
--- a/t/mda_filter_rubylang.t
+++ b/t/mda_filter_rubylang.t
@@ -16,6 +16,7 @@ use_ok 'PublicInbox::V2Writable';
 my $tmpdir = tempdir('mda-XXXXXX', TMPDIR => 1, CLEANUP => 1);
 my $pi_config = "$tmpdir/pi_config";
 local $ENV{PI_CONFIG} = $pi_config;
+local $ENV{PI_EMERGENCY} = "$tmpdir/emergency";
 my $mda = 'blib/script/public-inbox-mda';
 my @cfg = ('git', 'config', "--file=$pi_config");
 is(system(@cfg, 'publicinboxmda.spamcheck', 'none'), 0);