diff --git a/lib/ace/virtual_renderer.js b/lib/ace/virtual_renderer.js
index 81aded8a..fbc2ecaa 100644
--- a/lib/ace/virtual_renderer.js
+++ b/lib/ace/virtual_renderer.js
@@ -459,10 +459,11 @@ var VirtualRenderer = function(container, theme) {
                 this.$gutterLayer.update(this.layerConfig);
         }
         else if (changes & this.CHANGE_LINES) {
-            this.$updateLines();
-            this.$updateScrollBar();
-            if (this.showGutter)
-                this.$gutterLayer.update(this.layerConfig);
+            if (this.$updateLines()) {
+                this.$updateScrollBar();
+                if (this.showGutter)
+                    this.$gutterLayer.update(this.layerConfig);
+            }
         } else if (changes & this.CHANGE_GUTTER) {
             if (this.showGutter)
                 this.$gutterLayer.update(this.layerConfig);
@@ -581,6 +582,7 @@ var VirtualRenderer = function(container, theme) {
 
         // else update only the changed rows
         this.$textLayer.updateLines(layerConfig, firstRow, lastRow);
+        return true;
     };
 
     this.$getLongestLine = function() {