diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index 1187dabb06..a94075f143 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -1100,7 +1100,7 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
             this.events.triggerEvent("tileloadstart", {tile: tile});
             this.numLoadingTiles++;
             if (!this.singleTile && this.backBuffer && this.gridResolution === this.backBufferResolution) {
-                OpenLayers.Element.addClass(tile.imgDiv, replacingCls);
+                OpenLayers.Element.addClass(tile.getTile(), replacingCls);
             }
         };
       
@@ -1112,13 +1112,14 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
                 aborted: aborted
             });
             if (!this.singleTile && !aborted && this.backBuffer && this.gridResolution === this.backBufferResolution) {
-                if (OpenLayers.Element.getStyle(tile.imgDiv, 'display') === 'none') {
+                var tileDiv = tile.getTile();
+                if (OpenLayers.Element.getStyle(tileDiv, 'display') === 'none') {
                     var bufferTile = document.getElementById(tile.id + '_bb');
                     if (bufferTile) {
                         bufferTile.parentNode.removeChild(bufferTile);
                     }
                 }
-                OpenLayers.Element.removeClass(tile.imgDiv, replacingCls);
+                OpenLayers.Element.removeClass(tileDiv, replacingCls);
             }
             //if that was the last tile, then trigger a 'loadend' on the layer
             if (this.numLoadingTiles === 0) {