diff --git a/qubesadmin/base.py b/qubesadmin/base.py
index f1f59d7..68bf804 100644
--- a/qubesadmin/base.py
+++ b/qubesadmin/base.py
@@ -275,6 +275,8 @@ class PropertyHolder(object):
                 value = value.name
             if value is None:
                 value = ''
+            if str(value).lower() == "none":
+                value = ''
             try:
                 self.qubesd_call(
                     self._method_dest,