diff --git a/egs/multi_en/ASR/prepare.sh b/egs/multi_en/ASR/prepare.sh
index 620904d73..b0ddc7341 100755
--- a/egs/multi_en/ASR/prepare.sh
+++ b/egs/multi_en/ASR/prepare.sh
@@ -1,8 +1,5 @@
 #!/usr/bin/env bash
 
-# fix segmentation fault reported in https://github.com/k2-fsa/icefall/issues/674
-export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python
-
 set -eou pipefail
 
 nj=16