diff --git a/src/calibre/devices/usbms/books.py b/src/calibre/devices/usbms/books.py
index d065d0f47a..be154f35c1 100644
--- a/src/calibre/devices/usbms/books.py
+++ b/src/calibre/devices/usbms/books.py
@@ -47,7 +47,7 @@ class Book(MetaInformation):
 
     def __eq__(self, other):
         # use lpath because the prefix can change, changing path
-        return self.path == getattr(other, 'lpath', None)
+        return self.lpath == getattr(other, 'lpath', None)
 
     @dynamic_property
     def db_id(self):