diff --git a/homeassistant/components/wilight/light.py b/homeassistant/components/wilight/light.py
index 73a34786f4f..10ff79fe60d 100644
--- a/homeassistant/components/wilight/light.py
+++ b/homeassistant/components/wilight/light.py
@@ -49,6 +49,9 @@ async def async_setup_entry(
 class WiLightLightOnOff(WiLightDevice, LightEntity):
     """Representation of a WiLights light on-off."""
 
+    _attr_color_mode = ColorMode.ONOFF
+    _attr_supported_color_modes = {ColorMode.ONOFF}
+
     @property
     def is_on(self):
         """Return true if device is on."""