diff --git a/lib/ace/virtual_renderer.js b/lib/ace/virtual_renderer.js
index 52c4ce69..c91f652b 100644
--- a/lib/ace/virtual_renderer.js
+++ b/lib/ace/virtual_renderer.js
@@ -119,12 +119,9 @@ var VirtualRenderer = function(container, theme) {
         _self.scrollLeft = scrollLeft;
         _self.session.setScrollLeft(scrollLeft);
 
-        if (scrollLeft == 0) {
-            _self.scroller.className = "ace_scroller";
-        }
-        else {
-            _self.scroller.className = "ace_scroller horscroll";
-        }
+        _self.scroller.className = scrollLeft == 0
+            ? "ace_scroller"
+            : "ace_scroller horscroll";
     });
 
     this.cursorPos = {
@@ -191,12 +188,16 @@ var VirtualRenderer = function(container, theme) {
 
     this.setSession = function(session) {
         this.session = session;
+        
+        this.scroller.className = "ace_scroller";
+        
         this.$cursorLayer.setSession(session);
         this.$markerBack.setSession(session);
         this.$markerFront.setSession(session);
         this.$gutterLayer.setSession(session);
         this.$textLayer.setSession(session);
         this.$loop.schedule(this.CHANGE_FULL);
+        
     };
 
     /**