diff --git a/storage_service/locations/models/package.py b/storage_service/locations/models/package.py
index 49ac5a29c..c7f2f689c 100644
--- a/storage_service/locations/models/package.py
+++ b/storage_service/locations/models/package.py
@@ -834,8 +834,7 @@ def index_file_data_from_aip_mets(self):
 
         path_to_mets, temp_dir = self.extract_file(relative_path)
 
-        mw = metsrw.mets.METSWriter()
-        mw.fromfile(path_to_mets)
+        mw = metsrw.METSDocument.fromfile(path_to_mets)
 
         for fsentry in mw.all_files():
             metadata = self._parse_file_metadata(fsentry)