diff --git a/tools/test_modules/m05500.pm b/tools/test_modules/m05500.pm
index c0dd67bdf..8f7f9f83f 100644
--- a/tools/test_modules/m05500.pm
+++ b/tools/test_modules/m05500.pm
@@ -6,6 +6,7 @@
 ##
 
 use strict;
+use warnings;
 
 use Authen::Passphrase::NTHash;
 use Digest::HMAC qw (hmac hmac_hex);
diff --git a/tools/test_modules/m05600.pm b/tools/test_modules/m05600.pm
index 7675b7116..33d2deb42 100644
--- a/tools/test_modules/m05600.pm
+++ b/tools/test_modules/m05600.pm
@@ -6,6 +6,7 @@
 ##
 
 use strict;
+use warnings;
 
 use Authen::Passphrase::NTHash;
 use Digest::HMAC qw (hmac hmac_hex);
diff --git a/tools/test_modules/m05700.pm b/tools/test_modules/m05700.pm
index 04fa5fe91..9bc9b2b06 100644
--- a/tools/test_modules/m05700.pm
+++ b/tools/test_modules/m05700.pm
@@ -6,6 +6,7 @@
 ##
 
 use strict;
+use warnings;
 
 use Digest::SHA  qw (sha256);
 use MIME::Base64 qw (encode_base64);
diff --git a/tools/test_modules/m05800.pm b/tools/test_modules/m05800.pm
index 9ea68237a..bbb1d1725 100644
--- a/tools/test_modules/m05800.pm
+++ b/tools/test_modules/m05800.pm
@@ -6,6 +6,7 @@
 ##
 
 use strict;
+use warnings;
 
 use Digest::SHA  qw (sha1);