--- Build.PL
+++ Build.PL
@@ -4,32 +4,6 @@ use warnings;
 
 use Module::Build 0.3601;
 
-my $class = Module::Build->subclass(code => <<'EOF');
-use File::Copy;
-use File::Spec::Functions;
-sub process_grammar_files {
-    my $self = shift;
-    my $grammar='Grammar.pm';
-
-    # precompile grammar
-    system("$^X -MParse::RecDescent - grammar Module::ExtractUse::Grammar");
-
-    # add $VERSION to grammer
-    open(my $fh,'<',$grammar) || die "cannot read $grammar: $!";
-    my @content = <$fh>;
-    close $fh;
-    splice(@content,1,0,'our $VERSION=0.345;'."\n");
-    open(my $out,">",$grammar) || die "cannot write $grammer: $!";
-    print $out @content;
-    close $out;
-
-    # move Grammer.pm to right place
-    my $target = catfile(qw(lib Module ExtractUse),$grammar);
-    move($grammar, $target) || die "Could not move precompiled $grammar to lib/Module/ExtractUse/Grammer.pm: $!";
-}
-
-EOF
-
 my %module_build_args = (
   'build_requires' => {
     'Module::Build' => '0.28',
@@ -59,10 +33,12 @@ my %module_build_args = (
     'license' => 'perl',
     'module_name' => 'Module::ExtractUse',
   'module_name' => 'Module::ExtractUse',
+  'PL_files' => {
+    'Grammar.PL' => 'lib/Module/ExtractUse/Grammar.pm'
+  },
   'recursive_test_files' => 1,
 );
 
-my $build = $class->new(%module_build_args);
-$build->add_build_element('grammar');
+my $build = Module::Build->new(%module_build_args);
 
 $build->create_build_script;
--- /dev/null
+++ Grammar.PL
@@ -0,0 +1,19 @@
+use File::Copy;
+
+my $target = shift;
+my $grammar = 'Grammar.pm';
+
+# precompile grammar
+system("$^X -MParse::RecDescent - grammar Module::ExtractUse::Grammar");
+
+# add $VERSION to grammar
+open(my $fh,'<',$grammar) || die "cannot read $grammar: $!";
+my @content = <$fh>;
+close $fh;
+splice(@content,1,0,'our $VERSION=0.341;'."\n");
+open(my $out,">",$grammar) || die "cannot write $grammar: $!";
+print $out @content;
+close $out;
+
+# move Grammar.pm to right place
+move($grammar, $target) || die "Could not move precompiled $grammar to $target: $!";
--- /dev/null
+++ lib/Module/ExtractUse/Grammar.pod
@@ -0,0 +1,24 @@
+
+=pod
+
+=head1 NAME
+
+Module::ExtractUse::Grammar - Module::ExtractUse::Grammar
+
+=head1 VERSION
+
+version 0.345
+
+=head1 AUTHOR
+
+Thomas Klausner <domm@cpan.org>
+
+=head1 COPYRIGHT AND LICENSE
+
+This software is copyright (c) 2014 - 2021 by Thomas Klausner.
+
+This is free software; you can redistribute it and/or modify it under
+the same terms as the Perl 5 programming language system itself.
+
+=cut
+