diff --git a/ChangeLog b/ChangeLog
index 9c39f0b761..efbc4d660e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jan 10 23:07:45 2005  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* variable.c (rb_autoload): hide internal data from ruby level.
+	  fixed: [ruby-dev:25373]
+
 Mon Jan 10 15:28:51 2005  GOTOU Yuuzou  <gotoyuzo@notwork.org>
 
 	* lib/webrick/cgi.rb (WEBrick::CGI::Socket#request_line): should
diff --git a/variable.c b/variable.c
index 9a9399721a..fb3e3cc4e7 100644
--- a/variable.c
+++ b/variable.c
@@ -1293,6 +1293,7 @@ rb_autoload(mod, id, file)
     }
     else {
 	av = Data_Wrap_Struct(rb_cData, rb_mark_tbl, st_free_table, 0);
+	RBASIC(av)->klass = 0;
 	st_add_direct(tbl, autoload, av);
 	DATA_PTR(av) = tbl = st_init_numtable();
     }