diff --git a/dom0/qvm-core/qubes.py b/dom0/qvm-core/qubes.py
index b55e0a1f..93bbe8db 100755
--- a/dom0/qvm-core/qubes.py
+++ b/dom0/qvm-core/qubes.py
@@ -1672,6 +1672,7 @@ class QubesVmCollection(dict):
         self.default_netvm_qid = None
         self.default_fw_netvm_qid = None
         self.default_template_qid = None
+        self.default_kernel = None
         self.updatevm_qid = None
         self.qubes_store_filename = store_filename