--- a/regexp_property_values.gemspec
+++ b/regexp_property_values.gemspec
@@ -15,9 +15,7 @@
   s.homepage      = 'https://github.com/jaynetics/regexp_property_values'
   s.license       = 'MIT'
 
-  s.files         = `git ls-files -z`.split("\x0").reject do |f|
-    f.match(%r{^(test|spec|features)/})
-  end
+  s.files         = Dir.glob("**/*").select {|v| v !~ /^debian/}
   s.require_paths = ['lib']
 
   s.extensions = %w[ext/regexp_property_values/extconf.rb]