Fix undef in lc warning

diff --git a/lib/Plack/App/Gruntmaster.pm b/lib/Plack/App/Gruntmaster.pm
index 503d0c426a1c5e57c2dc3cd1af6ffc7d94c39b04..17d198d74b976fcb95397f5e34214999365756bf 100644 (file)
--- a/lib/Plack/App/Gruntmaster.pm
+++ b/lib/Plack/App/Gruntmaster.pm
@@ -126,7 +126,7 @@ sub dispatch_request{
                },
 
                sub (?:format~) {
-                       my $format = lc $_{format} // '';
+                       my $format = lc ($_{format} // '');
                        response_filter {
                                my ($r) = @_;
                                return $r if ref $r ne 'Plack::App::Gruntmaster::Response';