diff --git a/un_used_methods.gemspec b/un_used_methods.gemspec
index e83aee7..aa1f76e 100644
--- a/un_used_methods.gemspec
+++ b/un_used_methods.gemspec
@@ -26,7 +26,8 @@ Gem::Specification.new do |spec|
   spec.files = IO.popen(%w[git ls-files -z], chdir: __dir__, err: IO::NULL) do |ls|
     ls.readlines("\x0", chomp: true).reject do |f|
       (f == gemspec) ||
-        f.start_with?(*%w[bin/ test/ spec/ features/ .git .github appveyor Gemfile])
+        f.start_with?(*%w[bin/ test/ spec/ features/ .git .github appveyor Gemfile]) ||
+        f.end_with?("#{spec.name}-#{spec.version}.gem")
     end
   end
   spec.bindir = "exe"