diff --git a/Parser.pm b/Parser.pm
index c938e8c..29fbb75 100644
--- a/Parser.pm
+++ b/Parser.pm
@@ -9,6 +9,7 @@
 package XML::Parser;
 
 use strict;
+use warnings;
 
 our ( $VERSION, $LWP_load_failed );
 
diff --git a/Parser/Style/Debug.pm b/Parser/Style/Debug.pm
index bc2b654..ce385a1 100644
--- a/Parser/Style/Debug.pm
+++ b/Parser/Style/Debug.pm
@@ -2,6 +2,7 @@
 
 package XML::Parser::Style::Debug;
 use strict;
+use warnings;
 
 sub Start {
     my $expat = shift;
diff --git a/Parser/Style/Objects.pm b/Parser/Style/Objects.pm
index 2412ccb..a6563b7 100644
--- a/Parser/Style/Objects.pm
+++ b/Parser/Style/Objects.pm
@@ -2,6 +2,7 @@
 
 package XML::Parser::Style::Objects;
 use strict;
+use warnings;
 
 sub Init {
     my $expat = shift;
diff --git a/Parser/Style/Stream.pm b/Parser/Style/Stream.pm
index b0e67fd..60f6612 100644
--- a/Parser/Style/Stream.pm
+++ b/Parser/Style/Stream.pm
@@ -2,6 +2,7 @@
 
 package XML::Parser::Style::Stream;
 use strict;
+use warnings;
 
 # This style invented by Tim Bray <tbray@textuality.com>
 
diff --git a/Parser/Style/Subs.pm b/Parser/Style/Subs.pm
index f529810..d545b7b 100644
--- a/Parser/Style/Subs.pm
+++ b/Parser/Style/Subs.pm
@@ -2,6 +2,7 @@
 
 package XML::Parser::Style::Subs;
 use strict;
+use warnings;
 
 sub Start {
     no strict 'refs';
diff --git a/Parser/Style/Tree.pm b/Parser/Style/Tree.pm
index 05901ec..fef3b8b 100644
--- a/Parser/Style/Tree.pm
+++ b/Parser/Style/Tree.pm
@@ -2,6 +2,7 @@
 
 package XML::Parser::Style::Tree;
 use strict;
+use warnings;
 
 sub Init {
     my $expat = shift;