diff --git a/ChangeLog b/ChangeLog
index 19b6ba129f..e75102c1f3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Feb  6 19:35:16 2010  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* tool/compile_prelude.rb: fix require path.
+
 Sat Feb  6 12:02:36 2010  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/delegate.rb (Delegator#method_missing),
diff --git a/tool/compile_prelude.rb b/tool/compile_prelude.rb
index 17b00f955a..7476e3910f 100755
--- a/tool/compile_prelude.rb
+++ b/tool/compile_prelude.rb
@@ -38,7 +38,7 @@ lines_list = preludes.map {|filename|
     line.gsub!(/RbConfig::CONFIG\["(\w+)"\]/) {
       key = $1
       unless mkconf
-        require 'rbconfig'
+        require './rbconfig'
         mkconf = RbConfig::MAKEFILE_CONFIG.merge('prefix'=>'#{TMP_RUBY_PREFIX}')
         setup_ruby_prefix = "TMP_RUBY_PREFIX = $:.reverse.find{|e|e!=\".\"}.sub(%r{(.*)/lib/.*}m, \"\\\\1\")\n"
         teardown_ruby_prefix = 'Object.class_eval { remove_const "TMP_RUBY_PREFIX" }'