diff --git a/bin/cp/Makefile b/bin/cp/Makefile
index 57883daad0d1..f4ca4d25c87f 100644
--- a/bin/cp/Makefile
+++ b/bin/cp/Makefile
@@ -1,7 +1,8 @@
 #	@(#)Makefile	8.1 (Berkeley) 5/31/93
-#	$Id$
+#	$Id: Makefile,v 1.4 1997/02/22 14:01:32 peter Exp $
 
 PROG=	cp
 SRCS=	cp.c utils.c
+CFLAGS+=	 -DVM_AND_BUFFER_CACHE_SYNCHRONIZED
 
 .include <bsd.prog.mk>