diff --git a/virtManager/uihelpers.py b/virtManager/uihelpers.py
index 5b6601fdb..d80d61eb2 100644
--- a/virtManager/uihelpers.py
+++ b/virtManager/uihelpers.py
@@ -358,13 +358,12 @@ def build_cache_combo(vm, combo):
     model = Gtk.ListStore(str, str)
     combo.set_model(model)
     set_combo_text_column(combo, 1)
-    model.set_sort_column_id(0, Gtk.SortType.ASCENDING)
 
     combo.set_active(-1)
     for m in virtinst.VirtualDisk.cache_types:
         model.append([m, m])
 
-    model.append([None, "default"])
+    model.insert(0, [None, "default"])
     combo.set_active(len(model) - 1)
 
 
diff --git a/virtinst/devicedisk.py b/virtinst/devicedisk.py
index 7a6a73d8f..79e92a817 100644
--- a/virtinst/devicedisk.py
+++ b/virtinst/devicedisk.py
@@ -163,8 +163,10 @@ class VirtualDisk(VirtualDevice):
     CACHE_MODE_NONE = "none"
     CACHE_MODE_WRITETHROUGH = "writethrough"
     CACHE_MODE_WRITEBACK = "writeback"
+    CACHE_MODE_DIRECTSYNC = "directsync"
+    CACHE_MODE_UNSAFE = "unsafe"
     cache_types = [CACHE_MODE_NONE, CACHE_MODE_WRITETHROUGH,
-        CACHE_MODE_WRITEBACK]
+        CACHE_MODE_WRITEBACK, CACHE_MODE_DIRECTSYNC, CACHE_MODE_UNSAFE]
 
     DEVICE_DISK = "disk"
     DEVICE_LUN = "lun"