diff --git a/lib/index.js b/lib/index.js
index c8d1790..561985d 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -89,7 +89,7 @@ Table.prototype.toString = function (){
     , head = options.head
     , chars = options.chars
     , truncater = options.truncate
-      , colWidths = options.colWidths || new Array(this.head.length)
+      , colWidths = options.colWidths || new Array(head.length)
       , totalWidth = 0;
 
     if (!head.length && !this.length) return '';