Fix errror in Ruby1.8.7
Fix errror in Ruby1.8.7

mactkg/specinfra,chorrell/specinfra,RoboticCheese/specinfra,seroron/specinfra,chef-partners/specinfra-cisco,sean-horn/specinfra,miketheman/specinfra,verisign/specinfra,elibus/specinfra,bodgit/specinfra,thenexus6/specinfra,stoned/specinfra,hfm/specinfra,mizzy/specinfra,sorah/specinfra,r7kamura/specinfra,nurse/specinfra,ihassin/specinfra,tacahilo/specinfra,aibou/specinfra,k0kubun/specinfra,edolnx/specinfra,uroesch/specinfra,serverspec/specinfra,sergueik/specinfra,pfaffle/specinfra,minimum2scp/specinfra,gh2k/specinfra,winebarrel/specinfra,higanworks/specinfra,electrical/specinfra,lurdan/specinfra,hideyuki/specinfra,chinthakagodawita/specinfra,stefanhorning/specinfra,glenux/contrib-specinfra