diff --git a/homeassistant/components/trafikverket_ferry/sensor.py b/homeassistant/components/trafikverket_ferry/sensor.py
index ff6b9d2e1ca..93f2d1987b6 100644
--- a/homeassistant/components/trafikverket_ferry/sensor.py
+++ b/homeassistant/components/trafikverket_ferry/sensor.py
@@ -32,21 +32,14 @@ ATTR_OTHER_INFO = "other_info"
 SCAN_INTERVAL = timedelta(minutes=5)
 
 
-@dataclass(frozen=True)
-class TrafikverketRequiredKeysMixin:
-    """Mixin for required keys."""
+@dataclass(frozen=True, kw_only=True)
+class TrafikverketSensorEntityDescription(SensorEntityDescription):
+    """Describes Trafikverket sensor entity."""
 
     value_fn: Callable[[dict[str, Any]], StateType | datetime]
     info_fn: Callable[[dict[str, Any]], StateType | list] | None
 
 
-@dataclass(frozen=True)
-class TrafikverketSensorEntityDescription(
-    SensorEntityDescription, TrafikverketRequiredKeysMixin
-):
-    """Describes Trafikverket sensor entity."""
-
-
 SENSOR_TYPES: tuple[TrafikverketSensorEntityDescription, ...] = (
     TrafikverketSensorEntityDescription(
         key="departure_time",