diff --git a/homeassistant/components/light/tradfri.py b/homeassistant/components/light/tradfri.py
index c71ca60ee03..63441e6d8af 100644
--- a/homeassistant/components/light/tradfri.py
+++ b/homeassistant/components/light/tradfri.py
@@ -108,6 +108,9 @@ class TradfriGroup(Light):
             keys['transition_time'] = int(kwargs[ATTR_TRANSITION]) * 10
 
         if ATTR_BRIGHTNESS in kwargs:
+            if kwargs[ATTR_BRIGHTNESS] == 255:
+                kwargs[ATTR_BRIGHTNESS] = 254
+
             self.hass.async_add_job(self._api(
                 self._group.set_dimmer(kwargs[ATTR_BRIGHTNESS], **keys)))
         else:
@@ -264,6 +267,9 @@ class TradfriLight(Light):
             keys['transition_time'] = int(kwargs[ATTR_TRANSITION]) * 10
 
         if ATTR_BRIGHTNESS in kwargs:
+            if kwargs[ATTR_BRIGHTNESS] == 255:
+                kwargs[ATTR_BRIGHTNESS] = 254
+
             self.hass.async_add_job(self._api(
                 self._light_control.set_dimmer(kwargs[ATTR_BRIGHTNESS],
                                                **keys)))