diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index 7ec3508794..d85129bf72 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -200,7 +200,7 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
             bounds.top = bounds.top + deltaLat;
             position.y = position.y + deltaY;
             var newTile = this.addTile(bounds, position);
-            newTile.draw((this.params.TRANSPARENT == 'true'));
+            newTile.draw(this.alpha);
             newRow.append(newTile);
         }
         
@@ -234,7 +234,7 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
             bounds.right = bounds.right + deltaLon;
             position.x = position.x + deltaX;
             var newTile = this.addTile(bounds, position);
-            newTile.draw((this.params.TRANSPARENT == 'true'));
+            newTile.draw(this.alpha);
             
             if (prepend) {
                 row = row.prepend(newTile);