diff --git a/src/calibre/devices/kobo/driver.py b/src/calibre/devices/kobo/driver.py
index 35847cdbf8..42d6cdc295 100644
--- a/src/calibre/devices/kobo/driver.py
+++ b/src/calibre/devices/kobo/driver.py
@@ -222,7 +222,7 @@ class KOBO(USBMS):
         return ImageID
 
     def delete_images(self, ImageID):
-        if ImageID == None:
+        if ImageID != None:
             path_prefix = '.kobo/images/'
             path = self._main_prefix + path_prefix + ImageID