diff --git a/ChangeLog b/ChangeLog
index d502825b48..cbd89e6d6f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -14,6 +14,8 @@ Fri Aug 23 17:06:48 2002  WATANABE Hirofumi  <eban@ruby-lang.org>
 
 	* win32/Makefile.sub, win32/setup.mak (sitearch): ditto.
 
+	* instruby.rb: ditto.
+
 Wed Aug 21 16:53:00 2002  Michal Rokos  <michal@ruby-lang.org>
 
 	* *.c: int, long types cleanup.
diff --git a/instruby.rb b/instruby.rb
index a18e7f39a7..7807837c52 100644
--- a/instruby.rb
+++ b/instruby.rb
@@ -20,13 +20,14 @@ end
 ruby_install_name = CONFIG["ruby_install_name"]
 version = "/"+CONFIG["MAJOR"]+"."+CONFIG["MINOR"]
 arch = "/"+CONFIG["arch"]
+sitearch = "/"+CONFIG["sitearch"]
 
 bindir = destdir+CONFIG["bindir"]
 libdir = destdir+CONFIG["libdir"]
 rubylibdir = destdir+CONFIG["prefix"]+"/lib/ruby"+version
 archlibdir = rubylibdir+arch
 sitelibdir = destdir+CONFIG["sitedir"]+version
-sitearchlibdir = sitelibdir+arch
+sitearchlibdir = sitelibdir+sitearch
 mandir = destdir+CONFIG["mandir"] + "/man1"
 wdir = Dir.getwd