diff --git a/src/calibre/devices/interface.py b/src/calibre/devices/interface.py
index 3a2db2ec30..cf328994e6 100644
--- a/src/calibre/devices/interface.py
+++ b/src/calibre/devices/interface.py
@@ -39,11 +39,6 @@ class DevicePlugin(Plugin):
 
     #: Height for thumbnails on the device
     THUMBNAIL_HEIGHT = 68
-    #: Width for thumbnails on the device. Setting this will force thumbnails
-    #: to this size, not preserving aspect ratio. If it is not set, then
-    #: the aspect ratio will be preserved and the thumbnail will be no higher
-    #: than THUMBNAIL_HEIGHT
-    # THUMBNAIL_WIDTH = 68
 
     #: Compression quality for thumbnails. Set this closer to 100 to have better
     #: quality thumbnails with fewer compression artifacts. Of course, the