diff --git a/ChangeLog b/ChangeLog
index 2b0d051ece..97df4da130 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sun Jan 25 12:02:56 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* win32/Makefile.sub (clean-ext): condition of EXTS was inverted.
+
 Sun Jan 25 11:50:20 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* lib/mkmf.rb (create_makefile):fixed the variables order because
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index 28542a1870..b3862c47c4 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -729,7 +729,7 @@ distclean:
 		@-rmdir $(EXTOUT:/=\)
 
 clean-ext distclean-ext realclean-ext::
-!if "$(EXTS)" == ""
+!if "$(EXTS)" != ""
 		@for %I in ($(EXTS)) \
 !else
 		@for /R ext %I in (.) \