diff --git a/lib/ace/mode/xquery.js b/lib/ace/mode/xquery.js
index eccadacb..5456be95 100644
--- a/lib/ace/mode/xquery.js
+++ b/lib/ace/mode/xquery.js
@@ -135,15 +135,14 @@ oop.inherits(Mode, TextMode);
         });
         
         worker.on("highlight", function(tokens) {
-          if(that.$deltas.length > 0) return;
           that.$tokenizer.tokens = tokens.data.tokens;
           that.$tokenizer.lines  = session.getDocument().getAllLines();
-          session.bgTokenizer.lines = [];
-          session.bgTokenizer.states = [];
           
           var rows = Object.keys(that.$tokenizer.tokens);
           for(var i=0; i < rows.length; i++) {
             var row = parseInt(rows[i]);
+            delete session.bgTokenizer.lines[row];
+            delete session.bgTokenizer.states[row];
             session.bgTokenizer.fireUpdateEvent(row, row);
           }
         });