diff --git a/egs/wenetspeech/ASR/local/preprocess_wenetspeech.py b/egs/wenetspeech/ASR/local/preprocess_wenetspeech.py
index 6afc56dda..64733eb15 100755
--- a/egs/wenetspeech/ASR/local/preprocess_wenetspeech.py
+++ b/egs/wenetspeech/ASR/local/preprocess_wenetspeech.py
@@ -62,6 +62,7 @@ def preprocess_wenet_speech():
         dataset_parts=dataset_parts,
         output_dir=src_dir,
         suffix="jsonl.gz",
+        prefix="wenetspeech",
     )
     assert manifests is not None