diff --git a/lib/extendStringPrototype.js b/lib/extendStringPrototype.js
index 97e7c6c..241157d 100644
--- a/lib/extendStringPrototype.js
+++ b/lib/extendStringPrototype.js
@@ -78,6 +78,7 @@ module['exports'] = function () {
       }
       else {
         if (typeof(theme[prop]) === 'string') {
+          colors[prop] = colors[theme[prop]];
           addProperty(prop, function () {
             return colors[theme[prop]](this);
           });