diff --git a/homeassistant/components/transmission/switch.py b/homeassistant/components/transmission/switch.py
index 1f95fc492fe..8e79d8246e0 100644
--- a/homeassistant/components/transmission/switch.py
+++ b/homeassistant/components/transmission/switch.py
@@ -18,22 +18,15 @@ from .coordinator import TransmissionDataUpdateCoordinator
 _LOGGING = logging.getLogger(__name__)
 
 
-@dataclass(frozen=True)
-class TransmissionSwitchEntityDescriptionMixin:
-    """Mixin for required keys."""
+@dataclass(frozen=True, kw_only=True)
+class TransmissionSwitchEntityDescription(SwitchEntityDescription):
+    """Entity description class for Transmission switches."""
 
     is_on_func: Callable[[TransmissionDataUpdateCoordinator], bool | None]
     on_func: Callable[[TransmissionDataUpdateCoordinator], None]
     off_func: Callable[[TransmissionDataUpdateCoordinator], None]
 
 
-@dataclass(frozen=True)
-class TransmissionSwitchEntityDescription(
-    SwitchEntityDescription, TransmissionSwitchEntityDescriptionMixin
-):
-    """Entity description class for Transmission switches."""
-
-
 SWITCH_TYPES: tuple[TransmissionSwitchEntityDescription, ...] = (
     TransmissionSwitchEntityDescription(
         key="on_off",