diff --git a/speechx/examples/ds2_ol/aishell/run.sh b/speechx/examples/ds2_ol/aishell/run.sh
index 049c9bf926682f6a89c73bb4bc7b4222cbbd5a49..0d5202788c48b4246007ee642030e512b91d977c 100755
--- a/speechx/examples/ds2_ol/aishell/run.sh
+++ b/speechx/examples/ds2_ol/aishell/run.sh
@@ -66,9 +66,9 @@ wer=./aishell_wer
 export GLOG_logtostderr=1
 
 
+cmvn=$data/cmvn.ark
 if [ ${stage} -le 1 ] && [ ${stop_stage} -ge 1 ]; then
     # 3. gen linear feat
-    cmvn=$data/cmvn.ark
     cmvn-json2kaldi --json_file=$ckpt_dir/data/mean_std.json --cmvn_write_path=$cmvn
 
     ./local/split_data.sh $data $data/$aishell_wav_scp $aishell_wav_scp $nj
@@ -159,4 +159,4 @@ if [ ${stage} -le 5 ] && [ ${stop_stage} -ge 5 ]; then
 
     cat $data/split${nj}/*/result_recognizer > $exp/${label_file}_recognizer
     utils/compute-wer.py --char=1 --v=1 $text $exp/${label_file}_recognizer > $exp/${wer}.recognizer
-fi
\ No newline at end of file
+fi