diff --git a/ChangeLog b/ChangeLog
index 150fd71f39..e25ca3a285 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jan 11 02:11:59 2013  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* lib/rbconfig/obsolete.rb (respond_to_missing?): use send because
+	  RbConfig.respond_to_missing? is now private.
+
 Thu Jan 10 22:00:58 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_core.h (VM_DEBUG_BP_CHECK): set 0 as default.
diff --git a/lib/rbconfig/obsolete.rb b/lib/rbconfig/obsolete.rb
index 8669186083..7025fb43fb 100644
--- a/lib/rbconfig/obsolete.rb
+++ b/lib/rbconfig/obsolete.rb
@@ -24,7 +24,7 @@ module ::RbConfig
 
     def respond_to_missing?(*args, &block)
       _warn_
-      ::RbConfig.respond_to_missing?(*args, &block)
+      ::RbConfig.send(:respond_to_missing?, *args, &block)
     end
   end
 end