diff --git a/colors.js b/colors.js
index b981317..e4b14ec 100644
--- a/colors.js
+++ b/colors.js
@@ -96,7 +96,7 @@ function stylize(str, style) {
       'yellow'    : ['<span style="color:yellow;">',  '</span>']
     };
   } else if (exports.mode === 'none') {
-    return str;
+    return str+'';
   } else {
     console.log('unsupported mode, try "browser", "console" or "none"');
   }
@@ -301,4 +301,4 @@ function zalgo(text, options) {
 // don't summon zalgo
 addProperty('zalgo', function () {
   return zalgo(this);
-});
\ No newline at end of file
+});