diff --git a/src/style/Color.js b/src/style/Color.js
index e00ec80cf6..62543bd411 100644
--- a/src/style/Color.js
+++ b/src/style/Color.js
@@ -817,7 +817,7 @@ var Color = Base.extend(new function() {
 				convert(components[2])
 			];
 			if (alpha < 1)
-				components.push(val < 0 ? 0 : val);
+				components.push(alpha < 0 ? 0 : alpha);
 			return hex
 					? '#' + ((1 << 24) + (components[0] << 16)
 						+ (components[1] << 8)