diff --git a/src/calibre/devices/prs505/driver.py b/src/calibre/devices/prs505/driver.py
index 4d3ac31540..3768b8be62 100644
--- a/src/calibre/devices/prs505/driver.py
+++ b/src/calibre/devices/prs505/driver.py
@@ -149,7 +149,7 @@ class PRS505(USBMS):
         # that we do not preserve aspect ratio
         if not self.settings().extra_customization[3]:
             self.THUMBNAIL_WIDTH = 168
-        # Set CAN_UPDATE_THUMBNAILS if the user has asked that thumbnails be
+        # Set WANTS_UPDATED_THUMBNAILS if the user has asked that thumbnails be
         # updated on every connect
         self.WANTS_UPDATED_THUMBNAILS = self.settings().extra_customization[2]
 
diff --git a/src/calibre/gui2/device.py b/src/calibre/gui2/device.py
index bf8c734089..ae38a8321b 100644
--- a/src/calibre/gui2/device.py
+++ b/src/calibre/gui2/device.py
@@ -1398,7 +1398,7 @@ class DeviceMixin(object): # {{{
 
         if update_metadata:
             if self.device_manager.is_device_connected:
-                if self.device_manager.device.CAN_UPDATE_THUMBNAILS:
+                if self.device_manager.device.WANTS_UPDATED_THUMBNAILS:
                     for blist in booklists:
                         for book in blist:
                             if book.cover and os.access(book.cover, os.R_OK):