diff --git a/draper.gemspec b/draper.gemspec
index 8b4353ec..0096cd82 100644
--- a/draper.gemspec
+++ b/draper.gemspec
@@ -13,12 +13,7 @@ Gem::Specification.new do |s|
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
   gemspec = File.basename(__FILE__)
-  s.files = IO.popen(%w[git ls-files -z], chdir: __dir__, err: IO::NULL) do |ls|
-    ls.readlines("\x0", chomp: true).reject do |f|
-      (f == gemspec) ||
-        f.start_with?(*%w[bin/ test/ spec/ features/ .git appveyor Gemfile])
-    end
-  end
+  s.files = `git ls-files -z lib CHANGELOG.md LICENSE README.md`.split("\x0")
   s.require_paths = ["lib"]
 
   s.required_ruby_version = '>= 2.2.2'