diff --git a/control/server.py b/control/server.py
index cc26ba2e..fff0de77 100644
--- a/control/server.py
+++ b/control/server.py
@@ -80,6 +80,7 @@ def __init__(self, config: GatewayConfig):
         self.monitor_client_process = None
         self.ceph_utils = None
         self.rpc_lock = threading.Lock()
+        self.group_id = 0
 
         self.name = self.config.get("gateway", "name")
         if not self.name: