diff --git a/egs/aishell4/ASR/prepare.sh b/egs/aishell4/ASR/prepare.sh
index 361cc26ab..e8d9eb7b9 100755
--- a/egs/aishell4/ASR/prepare.sh
+++ b/egs/aishell4/ASR/prepare.sh
@@ -79,7 +79,7 @@ if [ $stage -le 2 ] && [ $stop_stage -ge 2 ]; then
   log "Stage 2: Process aishell4"
   if [ ! -f data/fbank/aishell4/.fbank.done ]; then
     mkdir -p data/fbank/aishell4
-    lhotse prepare aishell4 $dl_dir/aishell4 data/manifests/aishell4
+    ./local/compute_fbank_aishell4.py --perturb-speed ${perturb_speed}
     touch data/fbank/aishell4/.fbank.done
   fi
 fi
diff --git a/egs/alimeeting/ASR/prepare.sh b/egs/alimeeting/ASR/prepare.sh
index 1709733c7..c8fed658d 100755
--- a/egs/alimeeting/ASR/prepare.sh
+++ b/egs/alimeeting/ASR/prepare.sh
@@ -7,6 +7,7 @@ set -eou pipefail
 
 stage=-1
 stop_stage=100
+perturb_speed=true
 
 # We assume dl_dir (download dir) contains the following
 # directories and files. If not, they will be downloaded
@@ -68,7 +69,7 @@ if [ $stage -le 2 ] && [ $stop_stage -ge 2 ]; then
   log "Stage 2: Process alimeeting"
   if [ ! -f data/fbank/alimeeting/.fbank.done ]; then
     mkdir -p data/fbank/alimeeting
-    lhotse prepare ali-meeting $dl_dir/alimeeting data/manifests/alimeeting
+    ./local/compute_fbank_alimeeting.py --perturb-speed ${perturb_speed}
   fi
 fi