diff --git a/homeassistant/components/tolo/config_flow.py b/homeassistant/components/tolo/config_flow.py
index 5cf91bdc3a8..d5d7e33a5e0 100644
--- a/homeassistant/components/tolo/config_flow.py
+++ b/homeassistant/components/tolo/config_flow.py
@@ -23,7 +23,7 @@ class ToloSaunaConfigFlow(ConfigFlow, domain=DOMAIN):
 
     VERSION = 1
 
-    _discovered_host: str | None = None
+    _discovered_host: str
 
     @staticmethod
     def _check_device_availability(host: str) -> bool: