diff --git a/lib/OpenLayers/Layer/TileCache.js b/lib/OpenLayers/Layer/TileCache.js
index c20bffbaf6..ed9906fcab 100644
--- a/lib/OpenLayers/Layer/TileCache.js
+++ b/lib/OpenLayers/Layer/TileCache.js
@@ -103,8 +103,8 @@ OpenLayers.Layer.TileCache = OpenLayers.Class(OpenLayers.Layer.Grid, {
         var res = this.map.getResolution();
         var bbox = this.maxExtent;
         var size = this.tileSize;
-        var tileX = Math.floor((bounds.left - bbox.left) / (res * size.w));
-        var tileY = Math.floor((bounds.bottom - bbox.bottom) / (res * size.h));
+        var tileX = Math.round((bounds.left - bbox.left) / (res * size.w));
+        var tileY = Math.round((bounds.bottom - bbox.bottom) / (res * size.h));
         var tileZ = this.map.zoom;
         /**
          * Zero-pad a positive integer.