diff --git a/sde_collections/sinequa_api.py b/sde_collections/sinequa_api.py
index 85552bda..52b2ce46 100644
--- a/sde_collections/sinequa_api.py
+++ b/sde_collections/sinequa_api.py
@@ -52,7 +52,7 @@
 
 
 class Api:
-    def __init__(self, server_name: str) -> None:
+    def __init__(self, server_name: str=None) -> None:
         self.server_name = server_name
         config = server_configs[server_name]
         self.app_name: str = config["app_name"]