diff --git a/src/bentoml/client.py b/src/bentoml/client.py
index 65fb5772c6..4b08fd4514 100644
--- a/src/bentoml/client.py
+++ b/src/bentoml/client.py
@@ -34,6 +34,9 @@ def __init__(self, svc: Service, server_url: str):
                 setattr(
                     self, name, functools.partial(self._sync_call, _bentoml_api=api)
                 )
+
+        for name, api in self._svc.apis.items():
+            if not hasattr(self, f"async_{name}"):
                 setattr(
                     self,
                     f"async_{name}",