Fix build on Ruby 1.8.7
Fix build on Ruby 1.8.7

aaam/puppetlabs-reboot,aaam/puppetlabs-reboot,puppetlabs/puppetlabs-reboot,cyberious/puppetlabs-reboot,cyberious/puppetlabs-reboot,ferventcoder/puppetlabs-reboot,puppetlabs/puppetlabs-reboot,ferventcoder/puppetlabs-reboot