diff --git a/egs/aidatatang_200zh/ASR/prepare.sh b/egs/aidatatang_200zh/ASR/prepare.sh
index 4749e1b7f..46ecd5769 100755
--- a/egs/aidatatang_200zh/ASR/prepare.sh
+++ b/egs/aidatatang_200zh/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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
 
 stage=-1
diff --git a/egs/aishell/ASR/prepare.sh b/egs/aishell/ASR/prepare.sh
index eaeecfc4a..5917668a1 100755
--- a/egs/aishell/ASR/prepare.sh
+++ b/egs/aishell/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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=15
diff --git a/egs/aishell2/ASR/prepare.sh b/egs/aishell2/ASR/prepare.sh
index 06810bfdd..3e8e840ab 100755
--- a/egs/aishell2/ASR/prepare.sh
+++ b/egs/aishell2/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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=30
diff --git a/egs/aishell4/ASR/prepare.sh b/egs/aishell4/ASR/prepare.sh
index c351e3964..cb2b73a3e 100755
--- a/egs/aishell4/ASR/prepare.sh
+++ b/egs/aishell4/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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
 
 stage=-1
diff --git a/egs/alimeeting/ASR/prepare.sh b/egs/alimeeting/ASR/prepare.sh
index 17224bb68..604cc92c6 100755
--- a/egs/alimeeting/ASR/prepare.sh
+++ b/egs/alimeeting/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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
 
 stage=-1
diff --git a/egs/csj/ASR/prepare.sh b/egs/csj/ASR/prepare.sh
index 052748ca6..c4ce91984 100755
--- a/egs/csj/ASR/prepare.sh
+++ b/egs/csj/ASR/prepare.sh
@@ -35,6 +35,9 @@
 # can generate other transcript formats by supplying your own config files. A few examples of these
 # config files can be found in local/conf.
 
+# fix segmentation fault reported in https://github.com/k2-fsa/icefall/issues/674
+export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=python
+
 set -eou pipefail
 
 nj=8
diff --git a/egs/gigaspeech/ASR/prepare.sh b/egs/gigaspeech/ASR/prepare.sh
index fd2532741..bd255dc6a 100755
--- a/egs/gigaspeech/ASR/prepare.sh
+++ b/egs/gigaspeech/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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=15
diff --git a/egs/librispeech/ASR/prepare.sh b/egs/librispeech/ASR/prepare.sh
index 94e003036..8668af0e4 100755
--- a/egs/librispeech/ASR/prepare.sh
+++ b/egs/librispeech/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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=15
diff --git a/egs/ptb/LM/prepare.sh b/egs/ptb/LM/prepare.sh
index 70586785d..91c3c667a 100755
--- a/egs/ptb/LM/prepare.sh
+++ b/egs/ptb/LM/prepare.sh
@@ -1,5 +1,8 @@
 #!/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=15
diff --git a/egs/spgispeech/ASR/prepare.sh b/egs/spgispeech/ASR/prepare.sh
index 231ebd742..4842f52d0 100755
--- a/egs/spgispeech/ASR/prepare.sh
+++ b/egs/spgispeech/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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=20
diff --git a/egs/tal_csasr/ASR/prepare.sh b/egs/tal_csasr/ASR/prepare.sh
index 340521ad8..d9938fa63 100755
--- a/egs/tal_csasr/ASR/prepare.sh
+++ b/egs/tal_csasr/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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
 
 stage=-1
diff --git a/egs/tedlium3/ASR/prepare.sh b/egs/tedlium3/ASR/prepare.sh
index ccb307a52..272cf7aed 100755
--- a/egs/tedlium3/ASR/prepare.sh
+++ b/egs/tedlium3/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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=15
diff --git a/egs/timit/ASR/prepare.sh b/egs/timit/ASR/prepare.sh
index d11cd3a05..148a9f51b 100644
--- a/egs/timit/ASR/prepare.sh
+++ b/egs/timit/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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
 
 num_phones=39
diff --git a/egs/wenetspeech/ASR/prepare.sh b/egs/wenetspeech/ASR/prepare.sh
index da7d7e061..50a00253d 100755
--- a/egs/wenetspeech/ASR/prepare.sh
+++ b/egs/wenetspeech/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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=15
diff --git a/egs/yesno/ASR/prepare.sh b/egs/yesno/ASR/prepare.sh
index 8fcee0290..d4ef8d601 100755
--- a/egs/yesno/ASR/prepare.sh
+++ b/egs/yesno/ASR/prepare.sh
@@ -1,5 +1,8 @@
 #!/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
 
 stage=-1