diff --git a/post-processor/atlas/post-processor.go b/post-processor/atlas/post-processor.go
index 9dad49b25..d37af7c97 100644
--- a/post-processor/atlas/post-processor.go
+++ b/post-processor/atlas/post-processor.go
@@ -144,15 +144,12 @@ func (p *PostProcessor) Configure(raws ...interface{}) error {
 func (p *PostProcessor) PostProcess(ui packer.Ui, artifact packer.Artifact) (packer.Artifact, bool, error) {
 	// todo: remove/reword after the migration
 	if p.config.Type == "vagrant.box" {
-		ui.Message("\n-----------------------------------------------------------------------------------\n" +
-			"Warning: Vagrant-related functionality will be moved from Terraform Enterprise into \n" +
-			"its own product, Vagrant Cloud. This migration is currently planned for June 27th, \n" +
-			"2017 at 6PM EDT/3PM PDT/10PM UTC. For more information see \n" +
+		return nil, false, fmt.Errorf("As of June 27th, Vagrant-related functionality has been removed from Terraform\n" +
+			"Enterprise into its own product, Vagrant Cloud. For more information see\n" +
 			"https://www.vagrantup.com/docs/vagrant-cloud/vagrant-cloud-migration.html\n" +
-			"In the meantime, you should activate your Vagrant Cloud account and replace your \n" +
-			"Atlas post-processor with the Vagrant Cloud post-processor. See\n" +
-			"https://www.packer.io/docs/post-processors/vagrant-cloud.html for more details." +
-			"-----------------------------------------------------------------------------------\n")
+			"Please replace the Atlas post-processor with the Vagrant Cloud post-processor,\n" +
+			"and see https://www.packer.io/docs/post-processors/vagrant-cloud.html for\n" +
+			"more detail.\n")
 	}
 	if _, err := p.client.Artifact(p.config.user, p.config.name); err != nil {
 		if err != atlas.ErrNotFound {