diff --git a/sys/dts/Makefile.inc b/sys/dts/Makefile.inc
index 4454755dc813..a62fd171edc6 100644
--- a/sys/dts/Makefile.inc
+++ b/sys/dts/Makefile.inc
@@ -1,6 +1,6 @@
 # $FreeBSD$
 
-SYSDIR?=${.CURDIR}/../../../..
+SYSDIR?=${SRCTOP}/sys
 
 test-dts:
 .for dts in ${DTS}