diff --git a/lib/vagrant/config/v2/root.rb b/lib/vagrant/config/v2/root.rb
index b2a6bf4f0..d35b5f2f4 100644
--- a/lib/vagrant/config/v2/root.rb
+++ b/lib/vagrant/config/v2/root.rb
@@ -45,14 +45,14 @@ module Vagrant
         #
         # @param [Environment] env
         # @return [Hash]
-        def validate(env)
+        def validate(machine)
           # Go through each of the configuration keys and validate
           errors = {}
           @keys.each do |_key, instance|
             if instance.respond_to?(:validate)
               # Validate this single item, and if we have errors then
               # we merge them into our total errors list.
-              result = instance.validate(env)
+              result = instance.validate(machine)
               if result && !result.empty?
                 result.each do |key, value|
                   if !value.empty?
diff --git a/plugins/kernel_v2/config/ssh.rb b/plugins/kernel_v2/config/ssh.rb
index a296c83fd..eff0f8481 100644
--- a/plugins/kernel_v2/config/ssh.rb
+++ b/plugins/kernel_v2/config/ssh.rb
@@ -15,7 +15,7 @@ module VagrantPlugins
       attr_accessor :forward_x11
       attr_accessor :shell
 
-      def validate(env)
+      def validate(machine)
         errors = []
 
         [:username, :max_tries, :timeout].each do |field|
@@ -23,7 +23,8 @@ module VagrantPlugins
           errors << I18n.t("vagrant.config.common.error_empty", :field => field) if !value
         end
 
-        if private_key_path && !File.file?(File.expand_path(private_key_path, env.root_path))
+        if private_key_path && \
+          !File.file?(File.expand_path(private_key_path, machine.env.root_path))
           errors << I18n.t("vagrant.config.ssh.private_key_missing", :path => private_key_path)
         end
 
diff --git a/plugins/kernel_v2/config/vm.rb b/plugins/kernel_v2/config/vm.rb
index 3c340c014..7a33c4e80 100644
--- a/plugins/kernel_v2/config/vm.rb
+++ b/plugins/kernel_v2/config/vm.rb
@@ -122,16 +122,14 @@ module VagrantPlugins
         define(DEFAULT_VM_NAME) if defined_vm_keys.empty?
       end
 
-      def validate(env)
+      def validate(machine)
         errors = []
         errors << I18n.t("vagrant.config.vm.box_missing") if !box
         errors << I18n.t("vagrant.config.vm.box_not_found", :name => box) if \
-          box && !box_url && !env.boxes.find(box, :virtualbox)
-        errors << I18n.t("vagrant.config.vm.base_mac_invalid") if \
-          env.boxes.find(box, :virtualbox) && !base_mac
+          box && !box_url && !machine.box
 
         shared_folders.each do |name, options|
-          hostpath = Pathname.new(options[:hostpath]).expand_path(env.root_path)
+          hostpath = Pathname.new(options[:hostpath]).expand_path(machine.env.root_path)
 
           if !hostpath.directory? && !options[:create]
             errors << I18n.t("vagrant.config.vm.shared_folder_hostpath_missing",