diff --git a/dagflow/init.py b/dagflow/init.py
index efa55fb..a45ba45 100644
--- a/dagflow/init.py
+++ b/dagflow/init.py
@@ -1,3 +1,4 @@
+import asyncio
 from functools import partial
 from ahserver.serverenv import ServerEnv
 from ahserver.configuredServer import add_cleanupctx