diff --git a/egs/aishell/ASR/zipformer_bbpe/decode.py b/egs/aishell/ASR/zipformer_bbpe/decode.py
index 366a215a7..475fa9489 100755
--- a/egs/aishell/ASR/zipformer_bbpe/decode.py
+++ b/egs/aishell/ASR/zipformer_bbpe/decode.py
@@ -551,7 +551,6 @@ def decode_dataset(
             assert len(hyps) == len(texts)
             for cut_id, hyp_words, ref_text in zip(cut_ids, hyps, texts):
                 ref_words = "".join(ref_text.split())
-                hyp_words = "".join(hyp_words)
 
                 this_batch.append((cut_id, ref_words, hyp_words))