diff --git a/homeassistant/components/raspyrfm/switch.py b/homeassistant/components/raspyrfm/switch.py
index b9506c3688c..a609ddb27d3 100644
--- a/homeassistant/components/raspyrfm/switch.py
+++ b/homeassistant/components/raspyrfm/switch.py
@@ -118,7 +118,7 @@ class RaspyRFMSwitch(SwitchEntity):
         return self._name
 
     @property
-    def assumed_state(self):
+    def assumed_state(self) -> bool:
         """Return True when the current state cannot be queried."""
         return True
 
diff --git a/pylint/plugins/hass_enforce_type_hints.py b/pylint/plugins/hass_enforce_type_hints.py
index 0e56e94d8cb..c5a79d166e2 100644
--- a/pylint/plugins/hass_enforce_type_hints.py
+++ b/pylint/plugins/hass_enforce_type_hints.py
@@ -707,6 +707,7 @@ _ENTITY_MATCH: list[TypeHintMatch] = [
     TypeHintMatch(
         function_name="assumed_state",
         return_type="bool",
+        mandatory=True,
     ),
     TypeHintMatch(
         function_name="force_update",