diff --git a/lib/tiles/offlineTilesEnabler.js b/lib/tiles/offlineTilesEnabler.js
index c6f63b4..3eab4af 100644
--- a/lib/tiles/offlineTilesEnabler.js
+++ b/lib/tiles/offlineTilesEnabler.js
@@ -391,7 +391,7 @@ define([
                  * @param buffer
                  * @returns {Extent}
                  */
-                layer.getExtentBuffer: function(/* int */ buffer, /* Extent */ extent){
+                layer.getExtentBuffer = function(/* int */ buffer, /* Extent */ extent){
                     extent.xmin -= buffer; extent.ymin -= buffer;
                     extent.xmax += buffer; extent.ymax += buffer;
                     return extent;
@@ -401,7 +401,7 @@ define([
                  * Helper method that returns an array of tile urls within a given extent and level
                  * @returns Array
                  */
-                layer.getTileUrls: function(extent,level){
+                layer.getTileUrls = function(extent,level){
                     var tilingScheme = new TilingScheme(this._baseMapLayer);
                     var level_cell_ids = tilingScheme.getAllCellIdsInExtent(extent,level);
                     var cells = [];