diff --git a/Makefile.inc1 b/Makefile.inc1
index d85ee49fc6da..b241cb348ae4 100644
--- a/Makefile.inc1
+++ b/Makefile.inc1
@@ -172,6 +172,7 @@ buildworld:
 .for _dir in ${INCDIRS}
 	mkdir -p ${WORLDTMP}/usr/include/${_dir}
 .endfor
+	ln -sf ${.CURDIR}/sys ${WORLDTMP}/sys
 .if !defined(NOCLEAN)
 	@echo
 	@echo "--------------------------------------------------------------"