diff --git a/src/ol/pixelbounds.js b/src/ol/pixelbounds.js
index 42a63f3b91..54f941edef 100644
--- a/src/ol/pixelbounds.js
+++ b/src/ol/pixelbounds.js
@@ -1,18 +1,34 @@
 goog.provide('ol.PixelBounds');
 
-goog.require('ol.Rectangle');
-
 
 
 /**
  * @constructor
- * @extends {ol.Rectangle}
  * @param {number} minX Minimum X.
- * @param {number} minY Minimum Y.
  * @param {number} maxX Maximum X.
+ * @param {number} minY Minimum Y.
  * @param {number} maxY Maximum Y.
  */
-ol.PixelBounds = function(minX, minY, maxX, maxY) {
-  goog.base(this, minX, minY, maxX, maxY);
+ol.PixelBounds = function(minX, maxX, minY, maxY) {
+
+  /**
+   * @type {number}
+   */
+  this.minX = minX;
+
+  /**
+   * @type {number}
+   */
+  this.maxX = maxX;
+
+  /**
+   * @type {number}
+   */
+  this.minY = minY;
+
+  /**
+   * @type {number}
+   */
+  this.maxY = maxY;
+
 };
-goog.inherits(ol.PixelBounds, ol.Rectangle);
diff --git a/src/ol/tilegrid/tilegrid.js b/src/ol/tilegrid/tilegrid.js
index ccf19ee22b..c5d04837d0 100644
--- a/src/ol/tilegrid/tilegrid.js
+++ b/src/ol/tilegrid/tilegrid.js
@@ -150,10 +150,10 @@ ol.tilegrid.TileGrid.prototype.getPixelBoundsForTileCoordAndResolution =
   var tileWidth = tileSize.width / scale;
   var tileHeight = tileSize.height / scale;
   var minX = Math.round(tileCoord.x * tileWidth);
-  var minY = Math.round(tileCoord.y * tileHeight);
   var maxX = Math.round((tileCoord.x + 1) * tileWidth);
+  var minY = Math.round(tileCoord.y * tileHeight);
   var maxY = Math.round((tileCoord.y + 1) * tileHeight);
-  return new ol.PixelBounds(minX, minY, maxX, maxY);
+  return new ol.PixelBounds(minX, maxX, minY, maxY);
 };