diff --git a/ChangeLog b/ChangeLog
index 7d6974889d..3aea7f2c96 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Aug  9 02:07:41 2009  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
+
+	* tool/compile_prelude.rb: fixes a regexp pattern for require.
+	  It had matched 'require("foo"('.
+
 Sat Aug  8 11:42:44 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* bignum.c (bigzero_p): removing BDIGITS() inside of the
diff --git a/tool/compile_prelude.rb b/tool/compile_prelude.rb
index 88b7d69f11..17b00f955a 100755
--- a/tool/compile_prelude.rb
+++ b/tool/compile_prelude.rb
@@ -51,8 +51,8 @@ lines_list = preludes.map {|filename|
         "nil"
       end
     }
-    if /require\s*(\(?)\s*(["'])(.*?)\2\s*\1/ =~ line
-      orig, path = $&, $3
+    if /require\s*\(?\s*(["'])(.*?)\1\s*\)?/ =~ line
+      orig, path = $&, $2
       srcdir = File.expand_path("../..", __FILE__)
       path = File.expand_path(path, srcdir)
       if File.exist?(path)