diff --git a/test/rubygems/test_require.rb b/test/rubygems/test_require.rb
index f4b6abdf1730..f8e1d3f26ec1 100644
--- a/test/rubygems/test_require.rb
+++ b/test/rubygems/test_require.rb
@@ -66,6 +66,7 @@ def test_dash_i_beats_gems
     assert_require 'test_gem_require_a'
     assert_require 'b/c' # this should be required from -I
     assert_equal "world", ::Object::HELLO
+    assert_equal %w(a-1 b-1), loaded_spec_names
   ensure
     $LOAD_PATH.replace lp
     Object.send :remove_const, :HELLO if Object.const_defined? :HELLO