diff --git a/test/test_configuration.rb b/test/test_configuration.rb
index febc0cbe..9602c5c3 100644
--- a/test/test_configuration.rb
+++ b/test/test_configuration.rb
@@ -55,6 +55,8 @@ class TestConfiguration < JekyllUnitTest
 
     should "exclude ruby vendor directories" do
       exclude = Configuration.from({})["exclude"]
+      assert_includes exclude, "Gemfile"
+      assert_includes exclude, "Gemfile.lock"
       assert_includes exclude, "vendor/bundle/"
       assert_includes exclude, "vendor/cache/"
       assert_includes exclude, "vendor/gems/"