diff --git a/src/calibre/devices/smart_device_app/driver.py b/src/calibre/devices/smart_device_app/driver.py
index 33767d3e24..63119bf79b 100644
--- a/src/calibre/devices/smart_device_app/driver.py
+++ b/src/calibre/devices/smart_device_app/driver.py
@@ -23,7 +23,6 @@ from calibre.devices.usbms.deviceconfig import DeviceConfig
 from calibre.devices.usbms.driver import USBMS
 from calibre.ebooks import BOOK_EXTENSIONS
 from calibre.ebooks.metadata import title_sort
-from calibre.ebooks.metadata.book import SERIALIZABLE_FIELDS
 from calibre.ebooks.metadata.book.base import Metadata
 from calibre.ebooks.metadata.book.json_codec import JsonCodec
 from calibre.library import current_library_name