Index: Makefile.inc1
===================================================================
--- Makefile.inc1
+++ Makefile.inc1
@@ -1334,7 +1334,7 @@
 	    METALOG=${METALOG} ${IMAKE_INSTALL} ${IMAKE_MTREE} \
 	    DISTBASE=/base DESTDIR=${DESTDIR}/${DISTDIR}/base \
 	    LOCAL_MTREE=${LOCAL_MTREE:Q} distrib-dirs
-	${INSTALL_SYMLINK} usr/src/sys ${DESTDIR}/sys
+	${INSTALL_SYMLINK} usr/src/sys ${DESTDIR}/${DISTDIR}/sys
 .endif
 	${_+_}cd ${.CURDIR}; ${IMAKE} re${.TARGET:S/world$//}; \
 	    ${IMAKEENV} rm -rf ${INSTALLTMP}