diff --git a/test_boosters.gemspec b/test_boosters.gemspec
index 531cf2d..f06cef9 100644
--- a/test_boosters.gemspec
+++ b/test_boosters.gemspec
@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = "https://github.com/renderedtext/test-boosters"
   spec.license       = "MIT"
 
-  spec.files = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  spec.files = `git ls-files -z lib exe rspec_formatters LICENSE.txt README.md`.split("\x0")
   spec.bindir = "exe"
   spec.executables = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]