diff --git a/src/tile.js b/src/tile.js
index b615dce3..8f0a9280 100644
--- a/src/tile.js
+++ b/src/tile.js
@@ -771,7 +771,7 @@ $.Tile.prototype = {
      * @param {OpenSeadragon.Tile} tile
      */
     equals(tile) {
-         return this._ocKey === this._ocKey;
+         return this._ocKey === tile._ocKey;
     },
 
     /**
diff --git a/src/viewer.js b/src/viewer.js
index 482e127a..2c718b89 100644
--- a/src/viewer.js
+++ b/src/viewer.js
@@ -2733,7 +2733,6 @@ function getTileSourceImplementation( viewer, tileSource, imgOptions, successCal
             }
         } else {
             //can assume it's already a tile source implementation, force inheritance
-            tileSource = $.extend({}, $.TileSource.prototype, tileSource);
             waitUntilReady(tileSource, tileSource);
         }
     });