diff --git a/examples/vn_trader/run.py b/examples/vn_trader/run.py
index 43d4fca1..04f5b760 100644
--- a/examples/vn_trader/run.py
+++ b/examples/vn_trader/run.py
@@ -1,3 +1,4 @@
+# flake8: noqa
 from vnpy.event import EventEngine
 
 from vnpy.trader.engine import MainEngine