diff --git a/tests/http2-server.pl b/tests/http2-server.pl
index 558a3ad077..a537905dfb 100755
--- a/tests/http2-server.pl
+++ b/tests/http2-server.pl
@@ -30,6 +30,7 @@ use Cwd 'abs_path';
 use File::Basename;
 use File::Spec;
 
+use strict;
 use warnings 'FATAL' => 'all';
 
 my $logdir = "log";
diff --git a/tests/http3-server.pl b/tests/http3-server.pl
index 0c4cd77cee..066680fc06 100755
--- a/tests/http3-server.pl
+++ b/tests/http3-server.pl
@@ -31,6 +31,7 @@ use Cwd 'abs_path';
 use File::Basename;
 use File::Spec;
 
+use strict;
 use warnings 'FATAL' => 'all';
 
 my $logdir = "log";