diff --git a/hw4/informed_seq2seq_predictor.py b/hw4/informed_seq2seq_predictor.py
index bb67e5a70..4add2b982 100644
--- a/hw4/informed_seq2seq_predictor.py
+++ b/hw4/informed_seq2seq_predictor.py
@@ -23,4 +23,4 @@ def _json_to_instance(self, json_dict: JsonDict) -> Instance:
         """
         source = json_dict["source"]
         extra = json_dict["extra"]
-        return self._dataset_reader.text_to_instance(source, extra_str=extra)
+        return self._dataset_reader.text_to_instance(source, extra_seq=extra)