diff --git a/ChangeLog b/ChangeLog
index b4dcae0b03..8c18b84e47 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jun 17 17:30:00 2010  Kenta Murata <mrkn@mrkn.jp>
+
+	* ext/digest/sha2/extconf.rb: remove a check for uint64_t.
+
 Wed Jun 16 18:35:20 2010  Akinori MUSHA  <knu@iDaemons.org>
 
 	* ext/digest: Work around a build problem with VC++ 2010, likely
diff --git a/ext/digest/sha2/extconf.rb b/ext/digest/sha2/extconf.rb
index 4bc89bd42c..503880f13c 100644
--- a/ext/digest/sha2/extconf.rb
+++ b/ext/digest/sha2/extconf.rb
@@ -24,6 +24,4 @@ have_header("sys/cdefs.h")
 
 $preload = %w[digest]
 
-if have_type("uint64_t", "defs.h", $defs.join(' '))
-  create_makefile("digest/sha2")
-end
+create_makefile("digest/sha2")