diff --git a/src/calibre/library/database2.py b/src/calibre/library/database2.py
index 60f421623b..c125cad573 100644
--- a/src/calibre/library/database2.py
+++ b/src/calibre/library/database2.py
@@ -1425,6 +1425,7 @@ def add_format(self, index, format, stream, index_is_id=False, path=None,
         size=stream.tell()
         self.conn.execute('INSERT OR REPLACE INTO data (book,format,uncompressed_size,name) VALUES (?,?,?,?)',
                           (id, format.upper(), size, name))
+        self.dirtied([id], commit=False)
         self.conn.commit()
         self.format_filename_cache[id][format.upper()] = name
         self.refresh_ids([id])