diff --git a/egs/librispeech/asr/simple_v1/prepare.py b/egs/librispeech/asr/simple_v1/prepare.py
index 95758a74..84bb04ed 100755
--- a/egs/librispeech/asr/simple_v1/prepare.py
+++ b/egs/librispeech/asr/simple_v1/prepare.py
@@ -3,6 +3,7 @@
 # Copyright (c)  2020  Xiaomi Corporation (authors: Junbo Zhang, Haowen Qiu)
 # Apache 2.0
 
+import multiprocessing
 import os
 from concurrent.futures import ProcessPoolExecutor
 from pathlib import Path
@@ -39,8 +40,8 @@
 
 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(