diff --git a/src/calibre/db/cache.py b/src/calibre/db/cache.py
index f244c3405b..27fe673254 100644
--- a/src/calibre/db/cache.py
+++ b/src/calibre/db/cache.py
@@ -1242,6 +1242,7 @@ class Cache(object):
             except IndexError:
                 author = _('Unknown')
             self.backend.update_path(book_id, title, author, self.fields['path'], self.fields['formats'])
+            self.format_metadata_cache.pop(book_id, None)
             if mark_as_dirtied:
                 self._mark_as_dirty(book_ids)