diff --git a/openstack/blockstorage/extensions/volumetenants/results.go b/openstack/blockstorage/extensions/volumetenants/results.go
index 0d4c670..b7d51c7 100644
--- a/openstack/blockstorage/extensions/volumetenants/results.go
+++ b/openstack/blockstorage/extensions/volumetenants/results.go
@@ -1,7 +1,12 @@
 package volumetenants
 
-// An extension to the base Volume object
+// VolumeExt is an extension to the base Volume object
 type VolumeExt struct {
 	// TenantID is the id of the project that owns the volume.
 	TenantID string `json:"os-vol-tenant-attr:tenant_id"`
 }
+
+// UnmarshalJSON to override default
+func (r *VolumeExt) UnmarshalJSON(b []byte) error {
+	return nil
+}