diff --git a/lib/scope.js b/lib/scope.js
index 6c19c19a..11a1acd7 100644
--- a/lib/scope.js
+++ b/lib/scope.js
@@ -480,7 +480,11 @@ var base54 = (function() {
     var chars, frequency;
     function reset() {
         frequency = Object.create(null);
-        chars = string.split("").map(function(ch){ return ch.charCodeAt(0) });
+        var length = string.length;
+        chars = [];
+        for(var i=0;i<length;i++){
+            chars.push(string.charCodeAt(i));
+        }
         chars.forEach(function(ch){ frequency[ch] = 0 });
     }
     base54.consider = function(str){