diff --git a/src/xpra/server/server_core.py b/src/xpra/server/server_core.py
index 2e417d603a..b7c026d62e 100644
--- a/src/xpra/server/server_core.py
+++ b/src/xpra/server/server_core.py
@@ -1705,7 +1705,7 @@ def get_socket_info(self):
                 si.setdefault(socktype, {}).setdefault("listeners", []).append(info)
         for socktype, auth_classes in self.auth_classes.items():
             if auth_classes:
-                authenticators = si.setdefault(socktype, {})["authenticator"]
+                authenticators = si.setdefault(socktype, {}).setdefault("authenticator", {})
                 for i, auth_class in enumerate(auth_classes):
                     authenticators[i] = auth_class[0], auth_class[2]
         return si