diff --git a/live-build/ubuntu-cpc/hooks/042-vagrant.binary b/live-build/ubuntu-cpc/hooks/042-vagrant.binary
index 5851100c..d763ff18 100755
--- a/live-build/ubuntu-cpc/hooks/042-vagrant.binary
+++ b/live-build/ubuntu-cpc/hooks/042-vagrant.binary
@@ -88,6 +88,7 @@ cat << EOF > ${mount_d}/home/vagrant/.ssh/authorized_keys
 ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA6NF8iallvQVp22WDkTkyrtvp9eWW6A8YVr+kz4TjGYe7gHzIw+niNltGEFHzD8+v1I2YJ6oXevct1YeS0o9HZyN1Q9qgCgzUFtdOKLv6IedplqoPkcmF0aYet2PkEDo3MlTBckFXPITAMzF8dJSIFo9D8HfdOV0IAdx4O7PtixWKn5y2hMNG0zQPyUecp4pzC6kivAIhyfHilFR61RGL+GPXQ2MWZWFYbAGjyiYJnAmCP3NOTd0jMZEnDkbUvxhMmBYSdETk1rRgm+R4LOzFUGaHqHDLKLX+FIPKcF96hrucXzcWyLbIbEgE98OHlnVYCzRdK8jlqm8tehUc9c9WhQ== vagrant insecure public key
 EOF
 chroot ${mount_d} chown -R vagrant:vagrant /home/vagrant/.ssh
+chroot ${mount_d} chmod 700 /home/vagrant/.ssh
 
 umount_disk_image "$mount_d"
 rmdir "$mount_d"