diff --git a/release/Makefile b/release/Makefile
index 97827587868..228d71f69d1 100644
--- a/release/Makefile
+++ b/release/Makefile
@@ -376,6 +376,7 @@ rerelease release:
 	# Don't remove this, or the build will fall over!
 	echo "export RELEASEDIR=${_R}"		>> ${CHROOTDIR}/mk
 	echo "export PATH=${BOOTSTRAPDIR}:$${PATH}:${LOCALDIR}" >> ${CHROOTDIR}/mk
+	echo "export TMPDIR=/tmp"		>> ${CHROOTDIR}/mk
 	echo "if [ ! -f /tmp/.world_done ]; then" >> ${CHROOTDIR}/mk
 	echo "	cd /usr/src"			>> ${CHROOTDIR}/mk
 .if make(release)