diff --git a/ChangeLog b/ChangeLog
index f5d24d9628..e3f3af96a4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Mar 10 01:57:15 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/dl/callback/extconf.rb ($distcleanfiles): added callback.c.
+
 Tue Mar 10 00:06:21 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* configure.in (load_relative): new option to enable load path
diff --git a/ext/dl/callback/extconf.rb b/ext/dl/callback/extconf.rb
index 46aba28397..1e8e749e1f 100644
--- a/ext/dl/callback/extconf.rb
+++ b/ext/dl/callback/extconf.rb
@@ -1,14 +1,12 @@
 require 'mkmf'
 
 if compiled?("dl")
-  CALLBACKS = (0..8).map{|i| "callback-#{i}"}
-  CALLBACK_SRCS = CALLBACKS.map{|basename| "#{basename}.c"}
-  CALLBACK_OBJS = CALLBACKS.map{|basename| "#{basename}.o"}
-
-  $distcleanfiles += [ "callback.h", *CALLBACK_SRCS ]
-
-  $objs = %w[ callback.o ] + CALLBACK_OBJS
+  callbacks = (0..8).map{|i| "callback-#{i}"}.unshift("callback")
+  callback_srcs = callbacks.map{|basename| "#{basename}.c"}
+  callback_objs = callbacks.map{|basename| "#{basename}.o"}
 
+  $distcleanfiles += [ "callback.h", *callback_srcs ]
+  $objs = callback_objs
   $INCFLAGS << " -I$(srcdir)/.."
 
   create_makefile("dl/callback")