diff --git a/scripts/vm/hypervisor/xenserver/cloud-prepare-upgrade.sh b/scripts/vm/hypervisor/xenserver/cloud-prepare-upgrade.sh
index 857fcd24f52..3eb25c2060d 100755
--- a/scripts/vm/hypervisor/xenserver/cloud-prepare-upgrade.sh
+++ b/scripts/vm/hypervisor/xenserver/cloud-prepare-upgrade.sh
@@ -21,7 +21,7 @@ do
   do
     tagpif=$(xe pif-list network-uuid=$vlan_network host-uuid=$host --minimal)
     if [ -z $tagpif ]; then
-      pif=$(xe pif-list host-uuid=$host network_uuid=$untagged_network --minimal)
+      pif=$(xe pif-list host-uuid=$host network-uuid=$untagged_network --minimal)
       xe vlan-create network-uuid=$vlan_network pif-uuid=$pif vlan=$vlan
     fi
   done