diff --git a/python-api-examples/online-websocket-client-microphone.py b/python-api-examples/online-websocket-client-microphone.py
old mode 100755
new mode 100644
index 4d8966c4..9f70eeff
--- a/python-api-examples/online-websocket-client-microphone.py
+++ b/python-api-examples/online-websocket-client-microphone.py
@@ -24,6 +24,7 @@ https://github.com/k2-fsa/sherpa-onnx/blob/master/sherpa-onnx/csrc/online-websoc
 import argparse
 import asyncio
 import time
+import sys
 
 import numpy as np