diff --git a/lib/SVN/Notify.pm b/lib/SVN/Notify.pm
index 12fba99..1310fc8 100644
--- a/lib/SVN/Notify.pm
+++ b/lib/SVN/Notify.pm
@@ -1,6 +1,7 @@
 package SVN::Notify;
 
 use strict;
+use warnings;
 require 5.006_000;
 use constant WIN32  => $^O eq 'MSWin32';
 use constant PERL58 => $] > 5.007_000;
diff --git a/lib/SVN/Notify/Alternative.pm b/lib/SVN/Notify/Alternative.pm
index 78a0e91..dd6d5e2 100644
--- a/lib/SVN/Notify/Alternative.pm
+++ b/lib/SVN/Notify/Alternative.pm
@@ -1,6 +1,7 @@
 package SVN::Notify::Alternative;
 
 use strict;
+use warnings;
 use SVN::Notify ();
 
 $SVN::Notify::Alternative::VERSION = '2.87';
diff --git a/lib/SVN/Notify/Filter/Trac.pm b/lib/SVN/Notify/Filter/Trac.pm
index 51c5fd2..83d00bc 100644
--- a/lib/SVN/Notify/Filter/Trac.pm
+++ b/lib/SVN/Notify/Filter/Trac.pm
@@ -1,6 +1,7 @@
 package SVN::Notify::Filter::Trac;
 
 use strict;
+use warnings;
 use Text::Trac;
 use SVN::Notify;
 
diff --git a/lib/SVN/Notify/HTML.pm b/lib/SVN/Notify/HTML.pm
index 05eb9db..525a1c3 100644
--- a/lib/SVN/Notify/HTML.pm
+++ b/lib/SVN/Notify/HTML.pm
@@ -1,6 +1,7 @@
 package SVN::Notify::HTML;
 
 use strict;
+use warnings;
 use HTML::Entities;
 use SVN::Notify ();
 
diff --git a/lib/SVN/Notify/HTML/ColorDiff.pm b/lib/SVN/Notify/HTML/ColorDiff.pm
index 87140d0..a046a19 100644
--- a/lib/SVN/Notify/HTML/ColorDiff.pm
+++ b/lib/SVN/Notify/HTML/ColorDiff.pm
@@ -1,6 +1,7 @@
 package SVN::Notify::HTML::ColorDiff;
 
 use strict;
+use warnings;
 use HTML::Entities;
 use SVN::Notify::HTML ();