diff --git a/ChangeLog b/ChangeLog
index 62d6fc853e..5af77a75de 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Dec 24 16:18:57 2007  Koichi Sasada  <ko1@atdot.net>
+
+	* mkconfig.rb: add teeny to CONFIG['ruby_version'].
+
 Mon Dec 24 15:55:50 2007  Koichi Sasada  <ko1@atdot.net>
 
 	* tool/compile.rb, getrev.rb, runruby.rb: remove unused tools.
diff --git a/mkconfig.rb b/mkconfig.rb
index 1cd581cb4c..1086c57909 100755
--- a/mkconfig.rb
+++ b/mkconfig.rb
@@ -138,7 +138,7 @@ end
 print(*v_fast)
 print(*v_others)
 print <<EOS
-  CONFIG["ruby_version"] = "$(MAJOR).$(MINOR)"
+  CONFIG["ruby_version"] = "$(MAJOR).$(MINOR).$(TEENY)"
   CONFIG["rubylibdir"] = "$(libdir)/ruby/$(ruby_version)"
   CONFIG["archdir"] = "$(rubylibdir)/$(arch)"
   CONFIG["sitelibdir"] = "$(sitedir)/$(ruby_version)"