diff --git a/homeassistant/components/x10/light.py b/homeassistant/components/x10/light.py
index f007b799bf6..42a15a643bd 100644
--- a/homeassistant/components/x10/light.py
+++ b/homeassistant/components/x10/light.py
@@ -8,8 +8,8 @@ import voluptuous as vol
 
 from homeassistant.components.light import (
     ATTR_BRIGHTNESS,
-    COLOR_MODE_BRIGHTNESS,
     PLATFORM_SCHEMA,
+    ColorMode,
     LightEntity,
 )
 from homeassistant.const import CONF_DEVICES, CONF_ID, CONF_NAME
@@ -61,8 +61,8 @@ def setup_platform(
 class X10Light(LightEntity):
     """Representation of an X10 Light."""
 
-    _attr_color_mode = COLOR_MODE_BRIGHTNESS
-    _attr_supported_color_modes = {COLOR_MODE_BRIGHTNESS}
+    _attr_color_mode = ColorMode.BRIGHTNESS
+    _attr_supported_color_modes = {ColorMode.BRIGHTNESS}
 
     def __init__(self, light, is_cm11a):
         """Initialize an X10 Light."""