diff --git a/lib/Kwalify.pm b/lib/Kwalify.pm
index b06aebe..04149cb 100644
--- a/lib/Kwalify.pm
+++ b/lib/Kwalify.pm
@@ -14,6 +14,7 @@
 package Kwalify;
 
 use strict;
+use warnings;
 
 use base qw(Exporter);
 use vars qw(@EXPORT_OK $VERSION);
diff --git a/lib/Schema/Kwalify.pm b/lib/Schema/Kwalify.pm
index 4f47a53..b25f9c1 100644
--- a/lib/Schema/Kwalify.pm
+++ b/lib/Schema/Kwalify.pm
@@ -15,6 +15,8 @@
 package Schema::Kwalify;
 
 use strict;
+use warnings;
+
 use vars qw($VERSION);
 $VERSION = sprintf("%d.%02d", q$Revision: 1.4 $ =~ /(\d+)\.(\d+)/);