diff --git a/ChangeLog b/ChangeLog
index 30d80a78ae3d0f..947daec3ba7c97 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Dec 24 20:16:54 2007  Koichi Sasada  <ko1@atdot.net>
+
+	* instruby.rb: fix rdoc install dir.
+
 Mon Dec 24 18:37:32 2007  Tanaka Akira  <akr@fsij.org>
 
 	* re.c (rb_reg_prepare_re): show regexp encoding in the error message.
diff --git a/instruby.rb b/instruby.rb
index 6634a70a3e1800..4c3ee35d029476 100755
--- a/instruby.rb
+++ b/instruby.rb
@@ -236,7 +236,7 @@ def with_destdir(dir)
   if $rdocdir
     puts "installing rdoc"
 
-    ridatadir = File.join(CONFIG['datadir'], 'ri/$(MAJOR).$(MINOR)/system')
+    ridatadir = File.join(CONFIG['datadir'], 'ri/$(MAJOR).$(MINOR).$(TEENY)/system')
     Config.expand(ridatadir)
     makedirs [ridatadir]
     install_recursive($rdocdir, ridatadir)