diff --git a/src/ol/imagetile.js b/src/ol/imagetile.js
index 883bfe071b..b27d0e1bea 100644
--- a/src/ol/imagetile.js
+++ b/src/ol/imagetile.js
@@ -36,12 +36,6 @@ ol.ImageTile = function(tileCoord, state, src, crossOrigin, tileLoadFunction) {
     this.image_.crossOrigin = crossOrigin;
   }
 
-  /**
-   * @private
-   * @type {Object.<number, Image>}
-   */
-  this.imageByContext_ = {};
-
   /**
    * @private
    * @type {Array.<ol.EventsKey>}