--- a/net-ftp.gemspec
+++ b/net-ftp.gemspec
@@ -26,4 +26 @@
-  # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
-  spec.files         = Dir.chdir(File.expand_path('..', __FILE__)) do
-    `git ls-files -z 2>/dev/null`.split("\x0").reject { |f| f.match(%r{^(bin|test|spec|features)/}) }
-  end
+  spec.files         = Dir["lib/**/*.rb"]