diff --git a/pg.gemspec b/pg.gemspec
index 8444d63a5..356bdfd09 100644
--- a/pg.gemspec
+++ b/pg.gemspec
@@ -23,7 +23,9 @@ Gem::Specification.new do |spec|
   # Specify which files should be added to the gem when it is released.
   # The `git ls-files -z` loads the files in the RubyGem that have been added into git.
   spec.files = Dir.chdir(File.expand_path(__dir__)) do
-    `git ls-files -z`.split("\x0").reject { |f| f.match(%r{\A(?:test|spec|features|translation)/}) }
+    `git ls-files -z`.split("\x0").reject do |f|
+      f.match(%r{\A(?:test|spec|features|translation|\.)})
+    end
   end
   spec.extensions    = ["ext/extconf.rb"]
   spec.require_paths = ["lib"]