diff --git a/src/calibre/devices/mtp/driver.py b/src/calibre/devices/mtp/driver.py
index f36b068a30..21419960ae 100644
--- a/src/calibre/devices/mtp/driver.py
+++ b/src/calibre/devices/mtp/driver.py
@@ -243,7 +243,7 @@ class MTP_DEVICE(BASE):
                 use_subdirs = True,
                 news_in_folder = self.NEWS_IN_FOLDER,
                 )
-        return tuple(x.lower() for x in filepath.split('/'))
+        return tuple(x for x in filepath.split('/'))
 
     def prefix_for_location(self, on_card):
         # TODO: Implement this