1 files changed, 1 insertions, 0 deletions
diff --git a/t/mid.t b/t/mid.t
index 98b0c200..ecac04de 100644
--- a/t/mid.t
+++ b/t/mid.t
@@ -1,5 +1,6 @@
  # Copyright (C) 2016-2019 all contributors <meta@public-inbox.org>
  # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+use strict;
  use Test::More;
  use PublicInbox::MID qw(mid_escape mids references mids_for_index);