diff --git a/ChangeLog b/ChangeLog
index 1ef719c0ba..57f446bb89 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Apr 20 10:53:30 2005  WATANABE Hirofumi  <eban@ruby-lang.org>
+
+	* lib/rdoc/parsers/parse_rb.rb (lex_init): use IRB module.
+	  [ruby-core:04737]
+
 Wed Apr 20 07:27:18 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* {bcc32,win32,wince}/configure.bat, {bcc32,win32,wince}/setup.mak:
diff --git a/lib/rdoc/parsers/parse_rb.rb b/lib/rdoc/parsers/parse_rb.rb
index 8e91c01e61..41686aaaac 100644
--- a/lib/rdoc/parsers/parse_rb.rb
+++ b/lib/rdoc/parsers/parse_rb.rb
@@ -587,7 +587,7 @@ class RubyLex
   }
 
   def lex_init()
-    @OP = SLex.new
+    @OP = IRB::SLex.new
     @OP.def_rules("\0", "\004", "\032") do |chars, io|
       Token(TkEND_OF_SCRIPT).set_text(chars)
     end