diff --git a/.gitignore b/.gitignore
index 9fb338c7e..c9bb528fb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,4 @@ npm-debug.log
 /spec/fixtures/site/Gemfile.lock
 node_modules
 /lib/jekyll-admin/public
+*.gem
diff --git a/jekyll-admin.gemspec b/jekyll-admin.gemspec
index 1bc6b9fe0..91ecdd684 100644
--- a/jekyll-admin.gemspec
+++ b/jekyll-admin.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
     raise "RubyGems 2.0 or newer is required to protect against public gem pushes."
   end
 
-  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  spec.files         = Dir.glob("lib/**/*").concat(%w(LICENSE README.md))
   spec.bindir        = "exe"
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]