diff --git a/usr.bin/mt/Makefile b/usr.bin/mt/Makefile
index 253fa99055c6..b09a36b6d372 100644
--- a/usr.bin/mt/Makefile
+++ b/usr.bin/mt/Makefile
@@ -1,6 +1,7 @@
 #	@(#)Makefile	8.1 (Berkeley) 6/6/93
+#	$Id$
 
 PROG=	mt
-CFLAGS+=-I/sys
+CFLAGS+=-I${.CURDIR}/../../sys
 
 .include <bsd.prog.mk>