diff --git a/lib/ace/mode/xquery.js b/lib/ace/mode/xquery.js
index 5456be95..7dfdd5cf 100644
--- a/lib/ace/mode/xquery.js
+++ b/lib/ace/mode/xquery.js
@@ -112,20 +112,12 @@ oop.inherits(Mode, TextMode);
     };
     
     this.createWorker = function(session) {
-        this.$deltas = [];
-        var worker = new WorkerClient(["ace"], "ace/mode/xquery_worker", "XQueryWorker");
+        
+      var worker = new WorkerClient(["ace"], "ace/mode/xquery_worker", "XQueryWorker");
         var that = this;
 
-        session.getDocument().on('change', function(evt){
-          that.$deltas.push(evt.data);
-        });
-
         worker.attachToDocument(session.getDocument());
         
-        worker.on("start", function(e) {
-          that.$deltas = [];
-        });
-
         worker.on("error", function(e) {
           session.setAnnotations([e.data]);
         });