--- a/power_assert.gemspec
+++ b/power_assert.gemspec
@@ -15,5 +15 @@
-  s.files         = `git ls-files -z`.split("\x0").reject do |f|
-    f.match(%r{\A(?:test|spec|features|benchmark|bin)/})
-  end
-  s.bindir        = 'exe'
-  s.executables   = s.files.grep(%r{^exe/}) { |f| File.basename(f) }
+  s.files         = Dir['lib/**/*.rb']