diff --git a/gl-auth-command b/gl-auth-command
index ffb4060..cd3f450 100755
--- a/gl-auth-command
+++ b/gl-auth-command
@@ -1,6 +1,7 @@
-#!/usr/bin/perl -w
+#!/usr/bin/perl
 
 use strict;
+use warnings;
 
 # === auth-command ===
 # the command that GL users actually run
diff --git a/gl-compile-conf b/gl-compile-conf
index 76c4239..40d8088 100755
--- a/gl-compile-conf
+++ b/gl-compile-conf
@@ -1,6 +1,7 @@
-#!/usr/bin/perl -w
+#!/usr/bin/perl
 
 use strict;
+use warnings;
 use Data::Dumper;
 
 # === add-auth-keys ===
diff --git a/update-hook.pl b/update-hook.pl
index 2883a67..2e98911 100755
--- a/update-hook.pl
+++ b/update-hook.pl
@@ -1,6 +1,7 @@
-#!/usr/bin/perl -w
+#!/usr/bin/perl
 
 use strict;
+use warnings;
 
 # === update ===
 # this is gitolite's update hook