diff --git a/egs/aishell/transformer/path.sh b/egs/aishell/transformer/path.sh
index 7972642d0..b4064e152 100755
--- a/egs/aishell/transformer/path.sh
+++ b/egs/aishell/transformer/path.sh
@@ -3,3 +3,5 @@ export FUNASR_DIR=$PWD/../../..
 # NOTE(kan-bayashi): Use UTF-8 in Python to avoid UnicodeDecodeError when LC_ALL=C
 export PYTHONIOENCODING=UTF-8
 export PATH=$FUNASR_DIR/funasr/bin:$PATH
+
+export OMP_NUM_THREADS=1