diff --git a/ChangeLog b/ChangeLog
index 2409048a82..ba159fc1c2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sun Mar 16 12:29:55 2003  Tanaka Akira  <akr@m17n.org>
+
+        * lib/pp.rb (object_address_group): use to_s instead of name
+          to get name of class.
+
 Wed Mar 12 16:48:19 2003  WATANABE Hirofumi  <eban@ruby-lang.org>
 
 	* io.c (prep_stdio): set binmode only if the file descriptor
diff --git a/lib/pp.rb b/lib/pp.rb
index 2d09af4344..5a5456b3c8 100644
--- a/lib/pp.rb
+++ b/lib/pp.rb
@@ -190,7 +190,7 @@ class PP < PrettyPrint
     end
 
     def object_address_group(obj, &block)
-      group(1, sprintf('#<%s:0x%x', obj.class.name, obj.__id__ * 2), '>', &block)
+      group(1, sprintf('#<%s:0x%x', obj.class.to_s, obj.__id__ * 2), '>', &block)
     end
 
     def comma_breakable