diff --git a/egs/aishell/ASR/local/train_bbpe_model.py b/egs/aishell/ASR/local/train_bbpe_model.py
index 5ff6cc9af..48160897d 100755
--- a/egs/aishell/ASR/local/train_bbpe_model.py
+++ b/egs/aishell/ASR/local/train_bbpe_model.py
@@ -25,12 +25,12 @@
 # Please install a version >=0.1.96
 
 import argparse
-import re
 import shutil
 import tempfile
 from pathlib import Path
 
 import sentencepiece as spm
+
 from icefall import byte_encode, tokenize_by_CJK_char