diff --git a/bin/vagrant b/bin/vagrant
index 9b983c7f323..d7e35fe2438 100755
--- a/bin/vagrant
+++ b/bin/vagrant
@@ -14,7 +14,7 @@ begin
   # Kick start the CLI
   Vagrant::CLI.start(ARGV, :env => env)
 rescue Vagrant::Errors::VagrantError => e
-  opts = { :_prefix => false }
+  opts = { :prefix => false }
   env.ui.error e.message, opts if e.message
   env.ui.error e.backtrace.join("\n"), opts if ENV["VAGRANT_DEBUG"]
   exit e.status_code if e.respond_to?(:status_code)
diff --git a/lib/vagrant/command/box.rb b/lib/vagrant/command/box.rb
index 8df80f52afe..00218774dd3 100644
--- a/lib/vagrant/command/box.rb
+++ b/lib/vagrant/command/box.rb
@@ -25,8 +25,8 @@ def repackage(name)
       desc "list", "Lists all installed boxes"
       def list
         boxes = env.boxes.sort
-        return env.ui.warn(I18n.t("vagrant.commands.box.no_installed_boxes"), :_prefix => false) if boxes.empty?
-        boxes.each { |b| env.ui.info(b.name, :_prefix => false) }
+        return env.ui.warn(I18n.t("vagrant.commands.box.no_installed_boxes"), :prefix => false) if boxes.empty?
+        boxes.each { |b| env.ui.info(b.name, :prefix => false) }
       end
     end
   end
diff --git a/lib/vagrant/command/ssh_config.rb b/lib/vagrant/command/ssh_config.rb
index 92d70bd67c5..0feb4f562fa 100644
--- a/lib/vagrant/command/ssh_config.rb
+++ b/lib/vagrant/command/ssh_config.rb
@@ -14,7 +14,7 @@ def execute
           :ssh_user => vm.env.config.ssh.username,
           :ssh_port => vm.ssh.port,
           :private_key_path => vm.env.config.ssh.private_key_path
-        }), :_prefix => false)
+        }), :prefix => false)
       end
     end
   end
diff --git a/lib/vagrant/command/status.rb b/lib/vagrant/command/status.rb
index c4325cb73cb..b53359acba5 100644
--- a/lib/vagrant/command/status.rb
+++ b/lib/vagrant/command/status.rb
@@ -16,7 +16,7 @@ def route
         env.ui.info(I18n.t("vagrant.commands.status.output",
                     :states => results.join("\n"),
                     :message => I18n.t("vagrant.commands.status.#{state}")),
-                    :_prefix => false)
+                    :prefix => false)
       end
     end
   end
diff --git a/lib/vagrant/command/upgrade_to_060.rb b/lib/vagrant/command/upgrade_to_060.rb
index 3820e7a4ca1..4b811f28d1d 100644
--- a/lib/vagrant/command/upgrade_to_060.rb
+++ b/lib/vagrant/command/upgrade_to_060.rb
@@ -6,22 +6,22 @@ class UpgradeTo060Command < Base
       register "upgrade_to_060", "Upgrade pre-0.6.0 environment to 0.6.0", :hide => true
 
       def execute
-        @env.ui.warn I18n.t("vagrant.commands.upgrade_to_060.info"), :_prefix => false
-        @env.ui.warn "", :_prefix => false
-        if !@env.ui.yes? I18n.t("vagrant.commands.upgrade_to_060.ask"), :_prefix => false, :_color => :yellow
-          @env.ui.info I18n.t("vagrant.commands.upgrade_to_060.quit"), :_prefix => false
+        @env.ui.warn I18n.t("vagrant.commands.upgrade_to_060.info"), :prefix => false
+        @env.ui.warn "", :prefix => false
+        if !@env.ui.yes? I18n.t("vagrant.commands.upgrade_to_060.ask"), :prefix => false, :color => :yellow
+          @env.ui.info I18n.t("vagrant.commands.upgrade_to_060.quit"), :prefix => false
           return
         end
 
         local_data = @env.local_data
         if !local_data.empty?
           if local_data[:active]
-            @env.ui.confirm I18n.t("vagrant.commands.upgrade_to_060.already_done"), :_prefix => false
+            @env.ui.confirm I18n.t("vagrant.commands.upgrade_to_060.already_done"), :prefix => false
             return
           end
 
           # Backup the previous file
-          @env.ui.info I18n.t("vagrant.commands.upgrade_to_060.backing_up"), :_prefix => false
+          @env.ui.info I18n.t("vagrant.commands.upgrade_to_060.backing_up"), :prefix => false
           FileUtils.cp(local_data.file_path, "#{local_data.file_path}.bak-#{Time.now.to_i}")
 
           # Gather the previously set virtual machines into a single
@@ -38,7 +38,7 @@ def execute
           local_data.commit
         end
 
-        @env.ui.confirm I18n.t("vagrant.commands.upgrade_to_060.complete"), :_prefix => false
+        @env.ui.confirm I18n.t("vagrant.commands.upgrade_to_060.complete"), :prefix => false
       end
     end
   end
diff --git a/lib/vagrant/command/version.rb b/lib/vagrant/command/version.rb
index 53b312e13a8..51a956faa3f 100644
--- a/lib/vagrant/command/version.rb
+++ b/lib/vagrant/command/version.rb
@@ -6,7 +6,7 @@ class VersionCommand < Base
       def version
         env.ui.info(I18n.t("vagrant.commands.version.output",
                     :version => Vagrant::VERSION),
-                    :_prefix => false)
+                    :prefix => false)
       end
     end
   end
diff --git a/lib/vagrant/ui.rb b/lib/vagrant/ui.rb
index 393c2b2aee8..946e534ea02 100644
--- a/lib/vagrant/ui.rb
+++ b/lib/vagrant/ui.rb
@@ -34,7 +34,7 @@ def initialize(env, shell)
       [:ask, :no?, :yes?].each do |method|
         define_method(method) do |message, opts=nil|
           opts ||= {}
-          @shell.send(method, format_message(message, opts), opts[:_color])
+          @shell.send(method, format_message(message, opts), opts[:color])
         end
       end
 
@@ -50,8 +50,8 @@ def report_progress(progress, total, show_parts=true)
       protected
 
       def format_message(message, opts=nil)
-        opts = { :_prefix => true }.merge(opts || {})
-        message = "[#{env.resource}] #{message}" if opts[:_prefix]
+        opts = { :prefix => true }.merge(opts || {})
+        message = "[#{env.resource}] #{message}" if opts[:prefix]
         message
       end
 
diff --git a/test/vagrant/ui_test.rb b/test/vagrant/ui_test.rb
index cdd1fba7d3b..2f35abb3236 100644
--- a/test/vagrant/ui_test.rb
+++ b/test/vagrant/ui_test.rb
@@ -23,7 +23,7 @@ class ShellUITest < Test::Unit::TestCase
         true
       end
 
-      @instance.info("vagrant.errors.test_key", :_prefix => false)
+      @instance.info("vagrant.errors.test_key", :prefix => false)
     end
   end
 end