diff --git a/ChangeLog b/ChangeLog
index 4dbfcc6331..b8e05becee 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Aug  6 21:18:15 2009  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* ext/digest/sha2/lib/sha2.eb: should require sha2.so.
+
 Thu Aug  6 21:11:40 2009  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* ext/digest/sha2/sha2.c (*_Final): typos.
diff --git a/ext/digest/sha2/lib/sha2.rb b/ext/digest/sha2/lib/sha2.rb
index 52dd639f9b..b8e4609478 100644
--- a/ext/digest/sha2/lib/sha2.rb
+++ b/ext/digest/sha2/lib/sha2.rb
@@ -10,6 +10,7 @@
 #   $Id$
 
 require 'digest'
+require 'digest/sha2.so'
 
 module Digest
   #