diff --git a/src/color.js b/src/color.js
index 2f2947e16..4f2be5c3c 100644
--- a/src/color.js
+++ b/src/color.js
@@ -88,6 +88,10 @@ export default class Color {
   toJSON () {
     return this.alpha === 1 ? this.toHexString() : this.toRGBAString()
   }
+  
+  toString () {
+    return this.toRGBAString()
+  }
 
   isEqual (color) {
     if (this === color) {