diff --git a/src/calibre/devices/kobo/driver.py b/src/calibre/devices/kobo/driver.py
index 88a9650422..3b704aae78 100644
--- a/src/calibre/devices/kobo/driver.py
+++ b/src/calibre/devices/kobo/driver.py
@@ -3396,7 +3396,7 @@ class KOBOTOUCH(KOBO):
             _cover_file_endings = self.LIBRA_H2O_COVER_FILE_ENDINGS
         elif self.isMini():
             _cover_file_endings = self.LEGACY_COVER_FILE_ENDINGS
-        elif self.isNia()():
+        elif self.isNia():
             _cover_file_endings = self.GLO_COVER_FILE_ENDINGS
         elif self.isTouch():
             _cover_file_endings = self.LEGACY_COVER_FILE_ENDINGS