diff --git a/bin/ps/Makefile b/bin/ps/Makefile
index e5409ada1da..8d797bcd3b1 100644
--- a/bin/ps/Makefile
+++ b/bin/ps/Makefile
@@ -1,9 +1,9 @@
-#	$Id: Makefile,v 1.8 1997/02/22 14:04:57 peter Exp $
+#	$Id: Makefile,v 1.9 1997/08/11 02:36:09 steve Exp $
 #	@(#)Makefile	8.1 (Berkeley) 6/2/93
 
 PROG=	ps
 SRCS=	fmt.c keyword.c nlist.c print.c ps.c
-CFLAGS+=-I../../sys
+CFLAGS+=-I${.CURDIR}/../../sys
 DPADD=	${LIBM} ${LIBKVM}
 LDADD=	-lm -lkvm
 BINGRP=	kmem