diff --git a/homeassistant/components/nanoleaf/light.py b/homeassistant/components/nanoleaf/light.py
index 5902beba226..23d9032ff07 100644
--- a/homeassistant/components/nanoleaf/light.py
+++ b/homeassistant/components/nanoleaf/light.py
@@ -168,8 +168,8 @@ class NanoleafLight(LightEntity):
 
     async def async_turn_off(self, **kwargs):
         """Instruct the light to turn off."""
-        transition = kwargs.get(ATTR_TRANSITION)
-        await self._nanoleaf.turn_off(transition)
+        transition: float | None = kwargs.get(ATTR_TRANSITION)
+        await self._nanoleaf.turn_off(None if transition is None else int(transition))
 
     async def async_update(self) -> None:
         """Fetch new state data for this light."""