diff --git a/mrbgems/mruby-toplevel-ext/mrblib/toplevel.rb b/mrbgems/mruby-toplevel-ext/mrblib/toplevel.rb
index 7ba6e6e6f..c4631125f 100644
--- a/mrbgems/mruby-toplevel-ext/mrblib/toplevel.rb
+++ b/mrbgems/mruby-toplevel-ext/mrblib/toplevel.rb
@@ -2,9 +2,22 @@ def self.include(*modules)
   Object.include(*modules)
 end
 
-def self.private(*methods)
-end
-def self.protected(*methods)
-end
-def self.public(*methods)
+class <<self
+  private
+
+  def private(*methods)
+    Object.instance_eval do
+      private(*methods)
+    end
+  end
+  def protected(*methods)
+    Object.instance_eval do
+      protected(*methods)
+    end
+  end
+  def public(*methods)
+    Object.instance_eval do
+      public(*methods)
+    end
+  end
 end