diff --git a/ChangeLog b/ChangeLog
index 7cafecaa94..88a0031764 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,8 +1,10 @@
-Sun Feb 24 23:29:48 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+Sun Feb 24 23:39:59 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* common.mk, {bcc,win}32/Makefile.sub (clean-local): remove
 	  intermediate files.
 
+	* cygwin/GNUmakefile.in (clean-local): remove def file.
+
 Sun Feb 24 06:49:12 2008  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* debug.c (ruby_set_debug_option): separated ruby_each_words().
diff --git a/cygwin/GNUmakefile.in b/cygwin/GNUmakefile.in
index 03c2a2ca95..c750ad8ed9 100644
--- a/cygwin/GNUmakefile.in
+++ b/cygwin/GNUmakefile.in
@@ -67,6 +67,9 @@ $(LIBRUBY_SO): $(RUBYDEF)
 
 $(RUBYDEF): $(LIBRUBY_A) $(PREP) $(RBCONFIG)
 	$(MINIRUBY) $(srcdir)/win32/mkexports.rb -output=$@ $(LIBRUBY_A)
+
+clean-local:
+	@$(RM) $(RUBYDEF)
 endif
 
 ifeq (@target_os@,cygwin)