diff --git a/usr.sbin/pciconf/Makefile b/usr.sbin/pciconf/Makefile
index aba7ba479366..47a11dc454da 100644
--- a/usr.sbin/pciconf/Makefile
+++ b/usr.sbin/pciconf/Makefile
@@ -2,5 +2,6 @@
 
 PROG=	pciconf
 MAN8=	pciconf.8
+CFLAGS=+-I${.CURDIR}/../../sys
 
 .include <bsd.prog.mk>