diff --git a/ChangeLog b/ChangeLog
index 688e77c209..12fbd9c8fd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Apr 30 00:34:56 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* include/ruby/win32.h: remove redundunt declaration of
+	  rb_w32_time_subtract().
+
 Sat Apr 30 00:16:40 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* thread_pthread.c (gvl_init): fix hangup if GVL_SIMPLE_LOCK=1.
diff --git a/include/ruby/win32.h b/include/ruby/win32.h
index f24ba98b5f..13e01a4365 100644
--- a/include/ruby/win32.h
+++ b/include/ruby/win32.h
@@ -303,7 +303,6 @@ extern int rb_w32_stati64(const char *, struct stati64 *);
 extern int rb_w32_ustati64(const char *, struct stati64 *);
 extern int rb_w32_access(const char *, int);
 extern int rb_w32_uaccess(const char *, int);
-extern int rb_w32_subtract(struct timeval *rest, const struct timeval *wait);
 
 #ifdef __BORLANDC__
 extern int rb_w32_fstati64(int, struct stati64 *);