diff --git a/tests/http2-server.pl b/tests/http2-server.pl
index 8762000333..586fa638a3 100755
--- a/tests/http2-server.pl
+++ b/tests/http2-server.pl
@@ -30,6 +30,8 @@ use Cwd 'abs_path';
 use File::Basename;
 use File::Spec;
 
+use warnings;
+
 my $logdir = "log";
 my $pidfile = "$logdir/nghttpx.pid";
 my $logfile = "$logdir/http2.log";
diff --git a/tests/http3-server.pl b/tests/http3-server.pl
index b78d712b32..ea9eeb821c 100755
--- a/tests/http3-server.pl
+++ b/tests/http3-server.pl
@@ -31,6 +31,8 @@ use Cwd 'abs_path';
 use File::Basename;
 use File::Spec;
 
+use warnings;
+
 my $logdir = "log";
 my $pidfile = "$logdir/nghttpx.pid";
 my $logfile = "$logdir/http3.log";