diff --git a/lighter/configuration.py b/lighter/configuration.py
index ff0507e..7c8eaac 100644
--- a/lighter/configuration.py
+++ b/lighter/configuration.py
@@ -91,6 +91,7 @@ def __init__(self, host=None,
                  ignore_operation_servers=False,
                  ssl_ca_cert=None,
                  retries=None,
+                 proxy=None,
                  *,
                  debug: Optional[bool] = None
                  ) -> None:
@@ -187,7 +188,7 @@ def __init__(self, host=None,
            Default values is 100, None means no-limit.
         """
 
-        self.proxy: Optional[str] = None
+        self.proxy = proxy
         """Proxy URL
         """
         self.proxy_headers = None