diff --git a/egs/aishell/v1/local/aishell_data_prep.sh b/egs/aishell/v1/local/aishell_data_prep.sh
index 70d6ba1f3e5..11d131dcdb1 100755
--- a/egs/aishell/v1/local/aishell_data_prep.sh
+++ b/egs/aishell/v1/local/aishell_data_prep.sh
@@ -40,13 +40,11 @@ n=`cat $train_dir/wav.flist $dev_dir/wav.flist $test_dir/wav.flist | wc -l`
 # Transcriptions preparation
 for dir in $train_dir $test_dir; do
   echo Preparing $dir transcriptions
-  sed -e 's/\.wav//' $dir/wav.flist | awk -F '/' '{print $NF}' |\
-    sort > $dir/utt.list
-  sed -e 's/\.wav//' $dir/wav.flist | awk -F '/' '{i=NF-1;printf("%s %s\n",$NF,$i)}' |\
-    sort > $dir/utt2spk_all
+  sed -e 's/\.wav//' $dir/wav.flist | awk -F '/' '{print $NF}' > $dir/utt.list
+  sed -e 's/\.wav//' $dir/wav.flist | awk -F '/' '{i=NF-1;printf("%s %s\n",$NF,$i)}' > $dir/utt2spk_all
   paste -d' ' $dir/utt.list $dir/wav.flist > $dir/wav.scp_all
   utils/filter_scp.pl -f 1 $dir/utt.list $aishell_text_dir/*.txt > $dir/transcripts.txt
-  awk '{print $1}' $dir/transcripts.txt > $dir/utt.list
+  awk '{print $1}' $dir/transcripts.txt | sort -u > $dir/utt.list
   utils/filter_scp.pl -f 1 $dir/utt.list $dir/utt2spk_all | sort -u > $dir/utt2spk
   utils/filter_scp.pl -f 1 $dir/utt.list $dir/wav.scp_all | sort -u > $dir/wav.scp
   sort -u $dir/transcripts.txt > $dir/text