diff --git a/lib/Dist/Zilla/Plugin/FFI.pm b/lib/Dist/Zilla/Plugin/FFI.pm
index 5750bc3..192c8e1 100644
--- a/lib/Dist/Zilla/Plugin/FFI.pm
+++ b/lib/Dist/Zilla/Plugin/FFI.pm
@@ -1,8 +1,9 @@
-package Dist::Zilla::Plugin::FFI {
+use strict;
+use warnings;
+use 5.020;
+use true;
 
-  use strict;
-  use warnings;
-  use 5.020;
+package Dist::Zilla::Plugin::FFI {
 
   # ABSTRACT: FFI related Dist::Zilla plugins
 
@@ -31,6 +32,4 @@ Add L<FFI::CheckLib> checks into your C<Makefile.PL>.
 
 =cut
 
-}
-
-1;
+}
\ No newline at end of file
diff --git a/lib/Dist/Zilla/Plugin/FFI/Build.pm b/lib/Dist/Zilla/Plugin/FFI/Build.pm
index 3e71b0a..842251e 100644
--- a/lib/Dist/Zilla/Plugin/FFI/Build.pm
+++ b/lib/Dist/Zilla/Plugin/FFI/Build.pm
@@ -1,7 +1,10 @@
+use 5.020;
+use true;
+
 package Dist::Zilla::Plugin::FFI::Build {
 
-  use 5.020;
   use Moose;
+  use experimental qw( signatures );
   use List::Util qw( first );
 
   # ABSTRACT: Add FFI::Build to your Makefile.PL
@@ -125,9 +128,8 @@ EOF2
     isa => 'Maybe[Str]',
   );
 
-  sub munge_files
+  sub munge_files ($self)
   {
-    my($self) = @_;
     my $file = first { $_->name eq 'Makefile.PL' } @{ $self->zilla->files };
     $self->log_fatal("unable to find Makefile.PL")
       unless $file;
@@ -139,8 +141,7 @@ EOF2
     $file->content($content);
   }
 
-  sub register_prereqs {
-    my ($self) = @_;
+  sub register_prereqs ($self) {
     $self->zilla->register_prereqs( +{
         phase => 'configure',
         type  => 'requires',
@@ -170,17 +171,14 @@ EOF2
 
   }
 
-  sub metadata
+  sub metadata ($self)
   {
-    my($self) = @_;
     my %meta = ( dynamic_config => 1 );
     \%meta;
   }
 
-  sub prune_files
+  sub prune_files ($self)
   {
-    my($self) = @_;
-
     my $lang = $self->lang;
 
     foreach my $file ((), @{ $self->zilla->files })
@@ -203,6 +201,4 @@ EOF2
   }
 
   __PACKAGE__->meta->make_immutable;
-}
-
-1;
+}
\ No newline at end of file
diff --git a/lib/Dist/Zilla/Plugin/FFI/CheckLib.pm b/lib/Dist/Zilla/Plugin/FFI/CheckLib.pm
index 7b71951..639dd6c 100644
--- a/lib/Dist/Zilla/Plugin/FFI/CheckLib.pm
+++ b/lib/Dist/Zilla/Plugin/FFI/CheckLib.pm
@@ -1,12 +1,13 @@
-package Dist::Zilla::Plugin::FFI::CheckLib {
+use 5.020;
+use true;
 
-  use strict;
-  use warnings;
-  use 5.020;
+package Dist::Zilla::Plugin::FFI::CheckLib {
 
   # ABSTRACT: FFI::CheckLib alternative to Dist::Zilla::Plugin::CheckLib
 
   use Moose;
+  use experimental qw( signatures );
+
   with
     'Dist::Zilla::Role::FileMunger',
     'Dist::Zilla::Role::InstallTool',
@@ -52,8 +53,7 @@ package Dist::Zilla::Plugin::FFI::CheckLib {
     $config
   };
 
-  sub register_prereqs {
-    my ($self) = @_;
+  sub register_prereqs ($self) {
     $self->zilla->register_prereqs( +{
         phase => 'configure',
         type  => 'requires',
@@ -63,9 +63,7 @@ package Dist::Zilla::Plugin::FFI::CheckLib {
   }
 
   my %files;
-  sub munge_files {
-    my ($self) = @_;
-
+  sub munge_files ($self) {
     my @mfpl = grep
       {; $_->name eq 'Makefile.PL' or $_->name eq 'Build.PL' }
         @{ $self->zilla->files };
@@ -79,9 +77,7 @@ package Dist::Zilla::Plugin::FFI::CheckLib {
     ()
   }
 
-  sub setup_installer {
-    my ($self) = @_;
-
+  sub setup_installer ($self) {
     my @mfpl = grep
       {; $_->name eq 'Makefile.PL' or $_->name eq 'Build.PL' }
         @{ $self->zilla->files };
@@ -103,9 +99,7 @@ package Dist::Zilla::Plugin::FFI::CheckLib {
     ()
   }
 
-  sub _munge_file {
-    my ($self, $file) = @_;
-
+  sub _munge_file ($self, $file) {
     my $orig_content = $file->content;
     $self->log_fatal('could not find position in ' . $file->name . ' to modify!')
       unless $orig_content =~ m/use strict;\nuse warnings;\n\n/g;
diff --git a/t/00_diag.t b/t/00_diag.t
index ace4889..dc6a579 100644
--- a/t/00_diag.t
+++ b/t/00_diag.t
@@ -23,7 +23,9 @@ $modules{$_} = $_ for qw(
   Path::Tiny
   Test2::V0
   Test::DZil
+  experimental
   namespace::autoclean
+  true
 );