--- a/charlock_holmes.gemspec
+++ b/charlock_holmes.gemspec
@@ -5,7 +5,7 @@
   s.authors = ["Brian Lopez", "Vicent Martí"]
   s.email = "seniorlopez@gmail.com"
   s.extensions = ["ext/charlock_holmes/extconf.rb"]
-  s.files = `git ls-files ext lib`.split("\n")
+  s.files = Dir["lib/**/*", "ext/**/*"]
   s.homepage = "https://github.com/brianmario/charlock_holmes"
   s.rdoc_options = ["--charset=UTF-8"]
   s.summary = "Character encoding detection, brought to you by ICU"