diff --git a/etc/metadefs/compute-vmware-flavor.json b/etc/metadefs/compute-vmware-flavor.json
index ea60117964..7c501b5123 100644
--- a/etc/metadefs/compute-vmware-flavor.json
+++ b/etc/metadefs/compute-vmware-flavor.json
@@ -13,7 +13,17 @@
         "vmware:hw_version": {
             "title": "VMware Hardware Version",
             "description": "Specifies the hardware version VMware uses to create images. If the hardware version needs to be compatible with a cluster version, for backward compatibility or other circumstances, the vmware:hw_version key specifies a virtual machine hardware version. In the event that a cluster has mixed host version types, the key will enable the vCenter to place the cluster on the correct host.",
-            "type": "string"
+            "type": "string",
+            "enum": [
+                "vmx-13",
+                "vmx-11",
+                "vmx-10",
+                "vmx-09",
+                "vmx-08",
+                "vmx-07",
+                "vmx-04",
+                "vmx-03"
+            ]
         },
         "vmware:storage_policy": {
             "title": "VMware Storage Policy",