t/index-git-times.t   | 3 +++
 xt/eml_check_limits.t | 2 ++

diff --git a/t/index-git-times.t b/t/index-git-times.t
index 8f80c8669363d1892984bfa4487e3c1f779a8135..73c99e61edb1e3445fcc9919e27d3462d1b7bb28 100644
--- a/t/index-git-times.t
+++ b/t/index-git-times.t
@@ -1,5 +1,8 @@
+#!perl -w
 # Copyright (C) 2020 all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+use strict;
+use v5.10.1;
 use Test::More;
 use PublicInbox::TestCommon;
 use PublicInbox::Import;
diff --git a/xt/eml_check_limits.t b/xt/eml_check_limits.t
index cf780c77babaac401b72b6a38eb4925a1bc660c2..9f821946111456b736458480b6d15e309e5277d3 100644
--- a/xt/eml_check_limits.t
+++ b/xt/eml_check_limits.t
@@ -1,6 +1,8 @@
 #!perl -w
 # Copyright (C) 2020 all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+use strict;
+use v5.10.1;
 use Test::More;
 use PublicInbox::TestCommon;
 use PublicInbox::Eml;