diff --git a/lib/vagrant/action.rb b/lib/vagrant/action.rb
index 37473fa57..ec827beb8 100644
--- a/lib/vagrant/action.rb
+++ b/lib/vagrant/action.rb
@@ -15,6 +15,7 @@ module Vagrant
       autoload :EnvSet,  "vagrant/action/builtin/env_set"
       autoload :GracefulHalt, "vagrant/action/builtin/graceful_halt"
       autoload :HandleBoxUrl, "vagrant/action/builtin/handle_box_url"
+      autoload :HandleForwardedPortCollisions, "vagrant/action/builtin/handle_forwarded_port_collisions"
       autoload :Lock, "vagrant/action/builtin/lock"
       autoload :NFS, "vagrant/action/builtin/nfs"
       autoload :Provision, "vagrant/action/builtin/provision"