diff --git a/omada_respondd/config.py b/omada_respondd/config.py
index 102985e..6736b49 100644
--- a/omada_respondd/config.py
+++ b/omada_respondd/config.py
@@ -71,6 +71,7 @@ def from_dict(cls, cfg: Dict[str, str]) -> "Config":
             unicast_port=cfg["unicast_port"],
             interface=cfg["interface"],
             verbose=cfg["verbose"],
+            fallback_domain=cfg.get("fallback_domain", "omada_respondd_fallback"),
         )