diff --git a/test/ruby/test_module.rb b/test/ruby/test_module.rb
index 4e5f885..6ecc31b 100644
--- a/test/ruby/test_module.rb
+++ b/test/ruby/test_module.rb
@@ -1398,4 +1398,29 @@ class TestModule < Test::Unit::TestCase
     assert_equal([:@@bar, :@@foo], m2.class_variables(true))
     assert_equal([:@@bar], m2.class_variables(false))
   end
+
+  def test_extend_module_with_protected_method
+    list = []
+
+    x = Class.new {
+      extend Module.new {
+        protected
+
+        define_method(:inherited) do |klass|
+          list << "protected"
+          super(klass)
+        end
+      }
+
+      extend Module.new {
+        define_method(:inherited) do |klass|
+          list << "public"
+          super(klass)
+        end
+      }
+    }
+
+    Class.new(x)
+    assert_equal ['public', 'protected'], list
+  end
 end