diff --git a/lib/vagrant/util.rb b/lib/vagrant/util.rb
index 3eca4daa3..c135dacc2 100644
--- a/lib/vagrant/util.rb
+++ b/lib/vagrant/util.rb
@@ -26,6 +26,7 @@ module Vagrant
     autoload :IPV4Interfaces,            'vagrant/util/ipv4_interfaces'
     autoload :IsPortOpen,                'vagrant/util/is_port_open'
     autoload :KeyPair,                   'vagrant/util/key_pair'
+    autoload :LineBuffer,                'vagrant/util/line_buffer'
     autoload :LineEndingHelpers,         'vagrant/util/line_ending_helpers'
     autoload :LoggingFormatter,          'vagrant/util/logging_formatter'
     autoload :MapCommandOptions,         'vagrant/util/map_command_options'