diff --git a/ChangeLog b/ChangeLog
index 68d2f4b09f..dfaeaa3f13 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Jul  1 20:44:36 2008  Koichi Sasada  <ko1@atdot.net>
+
+	* tool/instruction.rb: RubyVM is not module.
+
 Tue Jul  1 19:31:24 2008  URABE Shyouhei  <shyouhei@ruby-lang.org>
 
 	* ext/digest/digest.c (rb_digest_instance_inspect): constified.
diff --git a/tool/instruction.rb b/tool/instruction.rb
index f270a18520..5e5eb0b78a 100644
--- a/tool/instruction.rb
+++ b/tool/instruction.rb
@@ -4,7 +4,7 @@
 
 require 'erb'
 
-module RubyVM
+class RubyVM
   class Instruction
     def initialize name, opes, pops, rets, comm, body, tvars, sp_inc,
                    orig = self, defopes = [], type = nil,