Ruby 1.8.6 Hash#select returns an array of results

Which results in a "odd number of arguments for Hash" error.

lib/vagrant/action/vm/nfs.rb

@@ -115,6 +115,7 @@ module Vagrant
 
           # Only mount the folders which have a guest path specified
           am_folders = folders.select { |name, folder| folder[:guestpath] }
+          am_folders = Hash[*am_folders.flatten] if am_folders.is_a?(Array)
           @env["vm"].system.mount_nfs(host_ip, Hash[am_folders])
         end