diff --git a/lib/ace/virtual_renderer.js b/lib/ace/virtual_renderer.js
index af5fa53e..ac1991ab 100644
--- a/lib/ace/virtual_renderer.js
+++ b/lib/ace/virtual_renderer.js
@@ -471,12 +471,13 @@ var VirtualRenderer = function(container, theme) {
 
     this.$computeLayerConfig = function() {
         var session = this.session;
+        var config = this.layerConfig
 
         var offset = this.scrollTop % this.lineHeight;
         var minHeight = this.$size.scrollerHeight + this.lineHeight;
 
         var longestLine = this.$getLongestLine();
-        var widthChanged = this.layerConfig.width != longestLine;
+        var widthChanged = config.width != longestLine;
 
         var horizScroll = this.$horizScrollAlwaysVisible || this.$size.scrollerWidth - longestLine < 0;
         var horizScrollChanged = this.$horizScroll !== horizScroll;
@@ -512,19 +513,17 @@ var VirtualRenderer = function(container, theme) {
 
         offset = this.scrollTop - firstRowScreen * this.lineHeight;
 
-        this.layerConfig = {
-            width : longestLine,
-            padding : this.$padding,
-            firstRow : firstRow,
-            firstRowScreen: firstRowScreen,
-            lastRow : lastRow,
-            lineHeight : this.lineHeight,
-            characterWidth : this.characterWidth,
-            minHeight : minHeight,
-            maxHeight : maxHeight,
-            offset : offset,
-            height : this.$size.scrollerHeight
-        };
+        config.width = longestLine;
+        config.padding = this.$padding;
+        config.firstRow = firstRow;
+        config.firstRowScreen = firstRowScreen;
+        config.lastRow = lastRow;
+        config.lineHeight = this.lineHeight;
+        config.characterWidth = this.characterWidth;
+        config.minHeight = minHeight;
+        config.maxHeight = maxHeight;
+        config.offset = offset;
+        config.height = this.$size.scrollerHeight;
 
         // For debugging.
         // console.log(JSON.stringify(this.layerConfig));