virt-sysprep removes /var/spool/at/.SEQ file which results on non working at

Issue

While preparing image wit RedHat Enterprise Linux 6.6 for use in cloud virt-sysprep is being used to remove any custom information. This command also removes /var/spool/at/.SEQ file which results in following error:

# at now + 1 minute
Cannot open lockfile /var/spool/at/.SEQ: No such file or directory

while running it in an instance.