diff --git a/src/ace/Document.js b/src/ace/Document.js
index f6474764..cbc06d33 100644
--- a/src/ace/Document.js
+++ b/src/ace/Document.js
@@ -501,7 +501,7 @@ var Document = function(text, mode) {
 
     this.undoChanges = function(deltas) {
         this.selection.clearSelection();
-        for (var i=0; i<deltas.length; i++) {
+        for (var i=deltas.length-1; i>=0; i--) {
             var delta = deltas[i];
             if (delta.action == "insertText") {
                 this.remove(delta.range, true);
diff --git a/src/ace/commands/DefaultCommands.js b/src/ace/commands/DefaultCommands.js
index a3a79150..6c4b9b94 100644
--- a/src/ace/commands/DefaultCommands.js
+++ b/src/ace/commands/DefaultCommands.js
@@ -34,7 +34,7 @@ PluginManager.registerCommand("find", function(editor, selection) {
     editor.find(needle);
 });
 PluginManager.registerCommand("undo", function(editor, selection) {
-  editor.undo();
+    editor.undo();
 });
 PluginManager.registerCommand("redo", function(editor, selection) {
     editor.redo();