diff --git a/externs/olx.js b/externs/olx.js
index fa20fd9235..b8662f75f9 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -49,55 +49,6 @@ olx.render.State.prototype.resolution;
 olx.render.State.prototype.rotation;
 
 
-/**
- * @typedef {{preemptive: (boolean|undefined),
- *     jsonp: (boolean|undefined),
- *     tileJSON: (TileJSON|undefined),
- *     url: (string|undefined)}}
- */
-olx.source.TileUTFGridOptions;
-
-
-/**
- * Use JSONP with callback to load the TileJSON. Useful when the server
- * does not support CORS. Default is `false`.
- * @type {boolean|undefined}
- * @api
- */
-olx.source.TileUTFGridOptions.prototype.jsonp;
-
-
-/**
- * If `true` the TileUTFGrid source loads the tiles based on their "visibility".
- * This improves the speed of response, but increases traffic.
- * Note that if set to `false`, you need to pass `true` as `opt_request`
- * to the `forDataAtCoordinateAndResolution` method otherwise no data
- * will ever be loaded.
- * Default is `true`.
- * @type {boolean|undefined}
- * @api
- */
-olx.source.TileUTFGridOptions.prototype.preemptive;
-
-
-/**
- * TileJSON configuration for this source. If not provided, `url` must be
- * configured.
- * @type {TileJSON|undefined}
- * @api
- */
-olx.source.TileUTFGridOptions.prototype.tileJSON;
-
-
-/**
- * TileJSON endpoint that provides the configuration for this source. Request
- * will be made through JSONP. If not provided, `tileJSON` must be configured.
- * @type {string|undefined}
- * @api
- */
-olx.source.TileUTFGridOptions.prototype.url;
-
-
 /**
  * @typedef {{cacheSize: (number|undefined),
  *     layer: string,
diff --git a/src/ol/source/TileUTFGrid.js b/src/ol/source/TileUTFGrid.js
index b13c6d4300..e0c07a17da 100644
--- a/src/ol/source/TileUTFGrid.js
+++ b/src/ol/source/TileUTFGrid.js
@@ -249,13 +249,30 @@ CustomTile.prototype.load = function() {
 };
 
 
+/**
+ * @typedef {Object} Options
+ * @property {boolean} [preemptive=true]
+ * If `true` the TileUTFGrid source loads the tiles based on their "visibility".
+ * This improves the speed of response, but increases traffic.
+ * Note that if set to `false`, you need to pass `true` as `opt_request`
+ * to the `forDataAtCoordinateAndResolution` method otherwise no data
+ * will ever be loaded.
+ * @property {boolean} [jsonp=false] Use JSONP with callback to load the TileJSON.
+ * Useful when the server does not support CORS..
+ * @property {tileJSON} [tileJSON] TileJSON configuration for this source.
+ * If not provided, `url` must be configured.
+ * @property {string} [url] TileJSON endpoint that provides the configuration for this source.
+ * Request will be made through JSONP. If not provided, `tileJSON` must be configured.
+ */
+
+
 /**
  * @classdesc
  * Layer source for UTFGrid interaction data loaded from TileJSON format.
  *
  * @constructor
  * @extends {ol.source.Tile}
- * @param {olx.source.TileUTFGridOptions} options Source options.
+ * @param {module:ol/source/TileUTFGrid~Options=} options Source options.
  * @api
  */
 const UTFGrid = function(options) {