diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index 90f553b40b..423f4490b4 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -325,7 +325,11 @@ OpenLayers.Layer.Grid = OpenLayers.Class(OpenLayers.Layer.HTTPRequest, {
         obj.gridResolution = null;
         // same for backbuffer and tile queue
         obj.backBuffer = null;
+        obj.backBufferTimerId = null;
         obj.tileQueue = [];
+        obj.tileQueueId = null;
+        obj.loading = false;
+        obj.moveTimerId = null;
 
         return obj;
     },