diff --git a/homeassistant/util/color.py b/homeassistant/util/color.py
index 26dca7ab0c6..06c9b4c6862 100644
--- a/homeassistant/util/color.py
+++ b/homeassistant/util/color.py
@@ -53,8 +53,12 @@ def color_xy_brightness_to_RGB(vX, vY, brightness):
         return (0, 0, 0)
 
     Y = brightness
-    X = (Y / vY) * vX
-    Z = (Y / vY) * (1 - vX - vY)
+    if vY != 0:
+        X = (Y / vY) * vX
+        Z = (Y / vY) * (1 - vX - vY)
+    else:
+        X = 0
+        Z = 0
 
     # Convert to RGB using Wide RGB D65 conversion.
     r = X * 1.612 - Y * 0.203 - Z * 0.302