diff --git a/ChangeLog b/ChangeLog
index 86177d96e0..7fcc45f3be 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Jul  8 14:33:26 2011  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* win32/Makefile.sub (config.h): define GC_MARK_STACKFRAME_WORD.
+	  fixed build problem of r32438.  the value (30) is temporary value.
+	  maybe it's enough by 20~24 according to my observation.
+
 Fri Jul  8 13:47:39 2011  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* thread.c (rb_mutex_unlock_all): folded into
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 0b1361a7c1..46c1bc7dcf 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -588,6 +588,7 @@ $(CONFIG_H): $(MKFILES) $(srcdir)/win32/Makefile.sub $(win_srcdir)/Makefile.sub
 #define GETGROUPS_T int
 #define RETSIGTYPE void
 #define TYPEOF_TIMEVAL_TV_SEC long
+#define GC_MARK_STACKFRAME_WORD 30
 #define HAVE_ALLOCA 1
 #define HAVE_DUP2 1
 #define HAVE_MEMCMP 1