diff --git a/lib/ace/ext/whitespace.js b/lib/ace/ext/whitespace.js
index b0b555fd..2378cadd 100644
--- a/lib/ace/ext/whitespace.js
+++ b/lib/ace/ext/whitespace.js
@@ -72,9 +72,7 @@ exports.$detectIndentation = function(lines, fallback) {
         return score;
     }
     
-    var changesTotal = 0;
-    for (var i in changes)
-        changesTotal += changes[i];
+    var changesTotal = changes.reduce(function(a,b){return a+b}, 0);
 
     var first = {score: 0, length: 0};
     var spaceIndents = 0;
@@ -112,6 +110,7 @@ exports.detectIndentation = function(session) {
     
     if (indent.length)
         session.setTabSize(indent.length);
+    return indent;
 };
 
 exports.trimTrailingSpace = function(session) {