diff --git a/jekyll-feed.gemspec b/jekyll-feed.gemspec
index dd9f29fb..1ed1a4e3 100644
--- a/jekyll-feed.gemspec
+++ b/jekyll-feed.gemspec
@@ -11,7 +11,7 @@ Gem::Specification.new do |spec|
   spec.homepage      = "https://github.com/jekyll/jekyll-feed"
   spec.license       = "MIT"
 
-  spec.files         = `git ls-files -z`.split("\x0")
+  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r!^(test|script|spec|features)/!) }
   spec.test_files    = spec.files.grep(%r!^spec/!)
   spec.require_paths = ["lib"]