diff --git a/src/calibre/devices/apple/driver.py b/src/calibre/devices/apple/driver.py
index 1b4bb8e408..67656908e2 100644
--- a/src/calibre/devices/apple/driver.py
+++ b/src/calibre/devices/apple/driver.py
@@ -957,7 +957,7 @@ class ITUNES(DevicePlugin):
 
                     dev_book_added = None
                     if self.manual_sync_mode:
-                        dev_book_added = self._add_device_book(fpath)
+                        added = dev_book_added = self._add_device_book(fpath)
 
                     if added:
                         thumb = None