diff --git a/egs/librispeech/asr/simple_v1/prepare.py b/egs/librispeech/asr/simple_v1/prepare.py
index d0971db6..0f688bcd 100755
--- a/egs/librispeech/asr/simple_v1/prepare.py
+++ b/egs/librispeech/asr/simple_v1/prepare.py
@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 
+import multiprocessing
 import os
 from concurrent.futures import ProcessPoolExecutor
 from pathlib import Path
@@ -37,14 +38,14 @@
 num_jobs = 1
 for partition, manifests in librispeech_manifests.items():
     print(partition)
-    with LilcomFilesWriter(f'{output_dir}/feats_{partition}'
-                           ) as storage, ProcessPoolExecutor(num_jobs) as ex:
+    with LilcomFilesWriter(f'{output_dir}/feats_{partition}') as storage, \
+        ProcessPoolExecutor(num_jobs, mp_context=multiprocessing.get_context("spawn")) as ex:
         cut_set = CutSet.from_manifests(
             recordings=manifests['recordings'],
             supervisions=manifests['supervisions']).compute_and_store_features(
                 extractor=Fbank(),
                 storage=storage,
-                augmenter=augmenter if 'train' in partition else None,
+                augment_fn=augmenter if 'train' in partition else None,
                 executor=ex)
     librispeech_manifests[partition]['cuts'] = cut_set
     cut_set.to_json(output_dir + f'/cuts_{partition}.json.gz')