diff --git a/rack-cors.gemspec b/rack-cors.gemspec
index 2efd73e..ada68f1 100644
--- a/rack-cors.gemspec
+++ b/rack-cors.gemspec
@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = 'https://github.com/cyu/rack-cors'
   spec.license       = 'MIT'
 
-  spec.files         = `git ls-files`.split($INPUT_RECORD_SEPARATOR).reject { |f| (f == '.gitignore') || f =~ /^examples/ }
+  spec.files         = Dir['CHANGELOG.md', 'README.md', 'LICENSE.txt', 'lib/**/*']
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ['lib']