diff --git a/contrib/pg_stat_statements/t/010_restart.pl b/contrib/pg_stat_statements/t/010_restart.pl
index 83a2bf0db8..426552c8d4 100644
--- a/contrib/pg_stat_statements/t/010_restart.pl
+++ b/contrib/pg_stat_statements/t/010_restart.pl
@@ -4,7 +4,7 @@
 # across restarts.
 
 use strict;
-use warnings;
+use warnings FATAL => 'all';
 use PostgreSQL::Test::Cluster;
 use PostgreSQL::Test::Utils;
 use Test::More;
diff --git a/src/bin/pg_upgrade/t/004_subscription.pl b/src/bin/pg_upgrade/t/004_subscription.pl
index d08ffffe10..4f7f6d9c04 100644
--- a/src/bin/pg_upgrade/t/004_subscription.pl
+++ b/src/bin/pg_upgrade/t/004_subscription.pl
@@ -2,7 +2,7 @@
 
 # Test for pg_upgrade of logical subscription
 use strict;
-use warnings;
+use warnings FATAL => 'all';
 
 use File::Find qw(find);