diff --git a/src/ol/tilecoord.js b/src/ol/tilecoord.js
index 2cee206180..013cc5af2c 100644
--- a/src/ol/tilecoord.js
+++ b/src/ol/tilecoord.js
@@ -21,6 +21,7 @@ ol.QuadKeyCharCode = {
  * @param {number} z Zoom level.
  * @param {number} x X.
  * @param {number} y Y.
+ * @struct
  */
 ol.TileCoord = function(z, x, y) {
 
diff --git a/src/ol/tilegrid/xyztilegrid.js b/src/ol/tilegrid/xyztilegrid.js
index 239e282bc8..53c8a23f22 100644
--- a/src/ol/tilegrid/xyztilegrid.js
+++ b/src/ol/tilegrid/xyztilegrid.js
@@ -89,14 +89,7 @@ ol.tilegrid.XYZ.prototype.createTileCoordTransform = function(opt_options) {
             return null;
           }
         }
-        if (goog.isDef(opt_tileCoord)) {
-          opt_tileCoord.z = z;
-          opt_tileCoord.x = x;
-          opt_tileCoord.y = -y - 1;
-          return opt_tileCoord;
-        } else {
-          return new ol.TileCoord(z, x, -y - 1);
-        }
+        return ol.TileCoord.createOrUpdate(z, x, -y - 1, opt_tileCoord);
       });
 };
 
diff --git a/src/ol/tilegrid/zoomifytilegrid.js b/src/ol/tilegrid/zoomifytilegrid.js
index 115f1734c8..6bf221c8fd 100644
--- a/src/ol/tilegrid/zoomifytilegrid.js
+++ b/src/ol/tilegrid/zoomifytilegrid.js
@@ -74,13 +74,6 @@ ol.tilegrid.Zoomify.prototype.createTileCoordTransform = function(opt_options) {
             return null;
           }
         }
-        if (goog.isDef(opt_tileCoord)) {
-          opt_tileCoord.z = z;
-          opt_tileCoord.x = x;
-          opt_tileCoord.y = -y - 1;
-          return opt_tileCoord;
-        } else {
-          return new ol.TileCoord(z, x, -y - 1);
-        }
+        return ol.TileCoord.createOrUpdate(z, x, -y - 1, opt_tileCoord);
       });
 };