diff --git a/lib/nova b/lib/nova
index 4d336f6..5f7a658 100644
--- a/lib/nova
+++ b/lib/nova
@@ -202,7 +202,10 @@
         instances=`sudo virsh list --all | grep $INSTANCE_NAME_PREFIX | sed "s/.*\($INSTANCE_NAME_PREFIX[0-9a-fA-F]*\).*/\1/g"`
         if [ ! "$instances" = "" ]; then
             echo $instances | xargs -n1 sudo virsh destroy || true
-            echo $instances | xargs -n1 sudo virsh undefine --managed-save || true
+            if ! xargs -n1 sudo virsh undefine --managed-save --nvram <<< $instances; then
+                # Can't delete with nvram flags, then just try without this flag
+                xargs -n1 sudo virsh undefine --managed-save <<< $instances
+            fi
         fi
 
         # Logout and delete iscsi sessions