diff --git a/lib/ace/document.js b/lib/ace/document.js
index 6a6d2b98..7de5cd9b 100644
--- a/lib/ace/document.js
+++ b/lib/ace/document.js
@@ -357,7 +357,7 @@ var Document = function(text) {
     this.applyDeltas = function(deltas) {
         for (var i=0; i<deltas.length; i++) {
             var delta = deltas[i];
-            var range = delta.range;
+            var range = Range.fromPoints(delta.range.start, delta.range.end);
             
             if (delta.action == "insertLines")
                 this.insertLines(range.start.row, delta.lines)
@@ -373,7 +373,7 @@ var Document = function(text) {
     this.revertDeltas = function(deltas) {
         for (var i=deltas.length-1; i>=0; i--) {
             var delta = deltas[i];
-            var range = delta.range;
+            var range = Range.fromPoints(delta.range.start, delta.range.end);
             
             if (delta.action == "insertLines")
                 this.removeLines(range.start.row, range.end.row)