diff --git a/test/vagrant-spec/scripts/centos-run.virtualbox.sh b/test/vagrant-spec/scripts/centos-run.virtualbox.sh
index 35f993609..0342a6901 100644
--- a/test/vagrant-spec/scripts/centos-run.virtualbox.sh
+++ b/test/vagrant-spec/scripts/centos-run.virtualbox.sh
@@ -1,6 +1,7 @@
 #!/bin/bash
 set -x
 
+export VAGRANT_EXPERIMENTAL="${VAGRANT_EXPERIMENTAL:-1}"
 export VAGRANT_SPEC_BOX="${VAGRANT_SPEC_BOX}"
 vagrant vagrant-spec ${VAGRANT_SPEC_ARGS} /vagrant/test/vagrant-spec/configs/vagrant-spec.config.virtualbox.rb
 result=$?
diff --git a/test/vagrant-spec/scripts/ubuntu-run.virtualbox.sh b/test/vagrant-spec/scripts/ubuntu-run.virtualbox.sh
index 35f993609..0342a6901 100644
--- a/test/vagrant-spec/scripts/ubuntu-run.virtualbox.sh
+++ b/test/vagrant-spec/scripts/ubuntu-run.virtualbox.sh
@@ -1,6 +1,7 @@
 #!/bin/bash
 set -x
 
+export VAGRANT_EXPERIMENTAL="${VAGRANT_EXPERIMENTAL:-1}"
 export VAGRANT_SPEC_BOX="${VAGRANT_SPEC_BOX}"
 vagrant vagrant-spec ${VAGRANT_SPEC_ARGS} /vagrant/test/vagrant-spec/configs/vagrant-spec.config.virtualbox.rb
 result=$?
diff --git a/test/vagrant-spec/scripts/windows-run.virtualbox.ps1 b/test/vagrant-spec/scripts/windows-run.virtualbox.ps1
index b2085e3d7..047799058 100644
--- a/test/vagrant-spec/scripts/windows-run.virtualbox.ps1
+++ b/test/vagrant-spec/scripts/windows-run.virtualbox.ps1
@@ -1,4 +1,7 @@
 cd /vagrant
 vagrant plugin install ./vagrant-spec.gem
 
+if ( $env:VAGRANT_EXPERIMENTAL -eq "" ) {
+  $env:VAGRANT_EXPERIMENTAL="1"
+}
 vagrant vagrant-spec $Env:VAGRANT_SPEC_ARGS /vagrant/test/vagrant-spec/configs/vagrant-spec.config.virtualbox.rb