diff --git a/custom_components/rpi_gpio_pwm/light.py b/custom_components/rpi_gpio_pwm/light.py
index f363e48..0c6ea28 100644
--- a/custom_components/rpi_gpio_pwm/light.py
+++ b/custom_components/rpi_gpio_pwm/light.py
@@ -203,4 +203,4 @@ def turn_off(self, **kwargs):
 
 def _from_hass_brightness(brightness):
     """Convert Home Assistant brightness units to percentage."""
-    return brightness / 255
+    return brightness / 255 or DEFAULT_BRIGHTNESS