diff --git a/perl/lib/Data/MessagePack.pm b/perl/lib/Data/MessagePack.pm
index 01e0fc0..9ce08c1 100644
--- a/perl/lib/Data/MessagePack.pm
+++ b/perl/lib/Data/MessagePack.pm
@@ -8,13 +8,13 @@ our $PreferInteger = 0;
 
 sub true () {
     require Data::MessagePack::Boolean;
-    no warnings 'once', 'redefine';
+    no warnings 'once';
     return $Data::MessagePack::Boolean::true;
 }
 
 sub false () {
     require Data::MessagePack::Boolean;
-    no warnings 'once', 'redefine';
+    no warnings 'once';
     return $Data::MessagePack::Boolean::false;
 }