make aborts with 'cp: failed to preserve ownership' error

[4ley]

make DIST=jessie IMAGE_MB=1024 results in the follwong error

Mounting boot partition on /dev/loop1...
cp: failed to preserve ownership for ‘mnt/meson8b_odroidc.dtb’: Operation not permitted
cp: failed to preserve ownership for ‘mnt/uImage’: Operation not permitted
rootfs.mak:64: recipe for target 'sdcard-jessie.img' failed
make[1]: *** [sdcard-jessie.img] Error 1
make[1]: Leaving directory '/usr/local/src/debian-mini-odroid-c1'
Makefile:34: recipe for target 'build-rootfs' failed
make: *** [build-rootfs] Error 2

# lsb_release -a
Distributor ID: Debian
Description:    Debian GNU/Linux 8.3 (jessie)
Release:        8.3
Codename:       jessie

# uname -r
3.16.0-4-amd64