diff --git a/simple_form.gemspec b/simple_form.gemspec
index 22c44c9a..e762aa76 100644
--- a/simple_form.gemspec
+++ b/simple_form.gemspec
@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.authors     = ['José Valim', 'Carlos Antônio', 'Rafael França']
 
   s.files         = Dir["CHANGELOG.md", "MIT-LICENSE", "README.md", "lib/**/*"]
-  s.test_files    = Dir["test/**/*"]
+  s.test_files    = Dir["test/**/*.rb"]
   s.test_files   -= Dir["test/support/country_select/**/*"]
   s.require_paths = ["lib"]