diff --git a/src/calibre/devices/usbms/deviceconfig.py b/src/calibre/devices/usbms/deviceconfig.py
index 2a750ba559..c7fafd7601 100644
--- a/src/calibre/devices/usbms/deviceconfig.py
+++ b/src/calibre/devices/usbms/deviceconfig.py
@@ -130,6 +130,9 @@ class DeviceConfig(object):
                 opts.extra_customization = []
             if not isinstance(opts.extra_customization, list):
                 opts.extra_customization = [opts.extra_customization]
+            for i,d in enumerate(cls.EXTRA_CUSTOMIZATION_DEFAULT):
+                if i >= len(opts.extra_customization):
+                    opts.extra_customization.append(d)
             opts.extra_customization = cls.migrate_extra_customization(opts.extra_customization)
         return opts