diff --git a/shibboleth-appliance-vbox.json b/shibboleth-appliance-vbox.json
index b4ea6be..7d9f20e 100644
--- a/shibboleth-appliance-vbox.json
+++ b/shibboleth-appliance-vbox.json
@@ -8,7 +8,8 @@
       "cpus": "2",
       "ssh_username": "centos",
       "ssh_password": "centos",
-      "region": "us-west-1"
+      "region": "us-west-1",
+      "outputfile_name": "shibboleth-appliance-centos7-vbox-{{timestamp}}.tar"
   },
   "provisioners": [
     {
@@ -57,7 +58,7 @@
   ],
   "post-processors": [
     {
-      "output": "builds/shibboleth-appliance-centos7-vbox-{{timestamp}}.tar",
+      "output": "builds/{{user `outputfile_name`}}",
       "type": "compress"
     }
   ]