diff --git a/ChangeLog b/ChangeLog
index 03dbe8c9b4..9a26b30710 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,6 @@
-Fri Jan 30 12:57:28 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Fri Jan 30 12:59:49 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* cygwin/GNUmakefile.in (RUBYDEF): depends on makefiles.
 
 	* cygwin/GNUmakefile.in (RUBYDEF): adds DATA to non-function symbols
 	  which is not marked as T.
diff --git a/cygwin/GNUmakefile.in b/cygwin/GNUmakefile.in
index c40e1285a0..fd9aa79214 100644
--- a/cygwin/GNUmakefile.in
+++ b/cygwin/GNUmakefile.in
@@ -67,7 +67,7 @@ endif
 
 $(LIBRUBY_SO): $(RUBYDEF)
 
-$(RUBYDEF): $(LIBRUBY_A) $(PREP) $(RBCONFIG)
+$(RUBYDEF): $(LIBRUBY_A) $(PREP) $(RBCONFIG) GNUmakefile
 ifeq (@target_os@,cygwin)
 	@NM@ --extern --defined $(LIBRUBY_A) | \
 	  $(MINIRUBY) -n -e 'BEGIN{puts "VERSION $(MAJOR).$(MINOR)","EXPORTS"}' \