diff --git a/ChangeLog b/ChangeLog
index 9dda4ba59d..f7b342fb6d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Mar  6 16:17:45 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* win32/Makefile.sub (.c.asm): removed $(COUTFLAG).
+
 Fri Mar  6 14:59:30 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* error.c (report_bug): message updated to better English.
diff --git a/win32/Makefile.sub b/win32/Makefile.sub
index add643fa97..c495152e6c 100644
--- a/win32/Makefile.sub
+++ b/win32/Makefile.sub
@@ -790,13 +790,13 @@ end
 	$(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) $(COUTFLAG)$@ -c -Tc$(<:\=/)
 
 {$(srcdir)/missing}.c.asm:
-	$(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) -Fa $(COUTFLAG)$@ -c -Tc$(<:\=/)
+	$(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) -Fa$@ -c -Tc$(<:\=/)
 {$(srcdir)/win32}.c.asm:
-	$(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) -Fa $(COUTFLAG)$@ -c -Tc$(<:\=/)
+	$(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) -Fa$@ -c -Tc$(<:\=/)
 {$(srcdir)}.c.asm:
-	$(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) -Fa $(COUTFLAG)$@ -c -Tc$(<:\=/)
+	$(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) -Fa$@ -c -Tc$(<:\=/)
 .c.asm:
-	$(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) -Fa $(COUTFLAG)$@ -c -Tc$(<:\=/)
+	$(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) -Fa$@ -c -Tc$(<:\=/)
 
 .rc.res:
 	$(RC) -I. -I$(<D) $(iconinc) -I$(srcdir)/win32 $(RFLAGS) -fo$@ $(<:\=/)