diff --git a/mrbgems/mruby-toplevel-ext/mrblib/toplevel.rb b/mrbgems/mruby-toplevel-ext/mrblib/toplevel.rb
index c4631125f..54c6a7c3b 100644
--- a/mrbgems/mruby-toplevel-ext/mrblib/toplevel.rb
+++ b/mrbgems/mruby-toplevel-ext/mrblib/toplevel.rb
@@ -1,10 +1,10 @@
-def self.include(*modules)
-  Object.include(*modules)
-end
-
 class <<self
   private
 
+  def include(*modules)
+    Object.include(*modules)
+  end
+
   def private(*methods)
     Object.instance_eval do
       private(*methods)