diff --git a/.rubocop.yml b/.rubocop.yml
index a1d794f..031f834 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,6 @@
 Metrics/BlockLength:
   Exclude:
+    - '*.gemspec'
     - 'spec/**/*'
 
 Metrics/ClassLength:
diff --git a/yle_tf.gemspec b/yle_tf.gemspec
index 8e5c1a7..1f7fdb9 100644
--- a/yle_tf.gemspec
+++ b/yle_tf.gemspec
@@ -23,9 +23,9 @@ Gem::Specification.new do |spec|
     'antti.forsell@iki.fi',
   ]
 
-  spec.files = `git ls-files -z`.split("\x0").reject do |f|
-    f.match(%r{^(test|spec|features)/})
-  end
+  spec.files = Dir['bin/**/*'] +
+               Dir['lib/**/*.rb'] +
+               Dir['vendor/**/*']
 
   spec.bindir        = 'bin'
   spec.executables   = ['tf']