diff --git a/lib/OpenLayers/Layer/Grid.js b/lib/OpenLayers/Layer/Grid.js
index cdb6c42835..87b79d87cf 100644
--- a/lib/OpenLayers/Layer/Grid.js
+++ b/lib/OpenLayers/Layer/Grid.js
@@ -65,7 +65,13 @@ OpenLayers.Layer.Grid.prototype = Object.extend( new OpenLayers.Layer(), {
         }
         if (!this.grid || zoomChanged) {
             this._initTiles();
-        } else { 
+        } else if ( bounds.top > this.getGridBounds().bottom ||
+                    bounds.left > this.getGridBounds().right ||
+                    bounds.right < this.getGridBounds().left ||
+                    bounds.bottom < this.getGridBounds().top  ) {
+            this._initTiles();
+        
+        } else {
             var i = 0;
             while (this.getGridBounds().bottom > bounds.bottom) {
                this.insertRow(false);