diff --git a/externs/olx.js b/externs/olx.js
index 6ea0e80913..78122dae45 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -5,57 +5,6 @@
 let olx;
 
 
-/**
- * @typedef {{className: (string|undefined),
- *     duration: (number|undefined),
- *     maxResolution: (number|undefined),
- *     minResolution: (number|undefined),
- *     render: (function(ol.MapEvent)|undefined)}}
- */
-olx.control.ZoomSliderOptions;
-
-
-/**
- * CSS class name.
- * @type {string|undefined}
- * @api
- */
-olx.control.ZoomSliderOptions.prototype.className;
-
-
-/**
- * Animation duration in milliseconds. Default is `200`.
- * @type {number|undefined}
- * @api
- */
-olx.control.ZoomSliderOptions.prototype.duration;
-
-
-/**
- * Maximum resolution.
- * @type {number|undefined}
- * @api
- */
-olx.control.ZoomSliderOptions.prototype.maxResolution;
-
-
-/**
- * Minimum resolution.
- * @type {number|undefined}
- * @api
- */
-olx.control.ZoomSliderOptions.prototype.minResolution;
-
-
-/**
- * Function called when the control should be re-rendered. This is called
- * in a requestAnimationFrame callback.
- * @type {function(ol.MapEvent)|undefined}
- * @api
- */
-olx.control.ZoomSliderOptions.prototype.render;
-
-
 /**
  * @typedef {{className: (string|undefined),
  *     target: (Element|string|undefined),
diff --git a/externs/xol.js b/externs/xol.js
index 7f887bf640..c173c6a3bc 100644
--- a/externs/xol.js
+++ b/externs/xol.js
@@ -1,15 +1,4 @@
 
-/**
- * @typedef {Object} control_ZoomSliderOptions
- * @property {string|undefined} className CSS class name.
- * @property {number|undefined} duration Animation duration in milliseconds. Default is `200`.
- * @property {number|undefined} maxResolution Maximum resolution.
- * @property {number|undefined} minResolution Minimum resolution.
- * @property {function(ol.MapEvent)|undefined} render Function called when the control should be re-rendered. This is called
- * in a requestAnimationFrame callback.
- */
-
-
 /**
  * @typedef {Object} control_ZoomToExtentOptions
  * @property {string|undefined} className Class name. Default is `ol-zoom-extent`.
diff --git a/src/ol/control/ZoomSlider.js b/src/ol/control/ZoomSlider.js
index 2685b7abf1..0663b9c90a 100644
--- a/src/ol/control/ZoomSlider.js
+++ b/src/ol/control/ZoomSlider.js
@@ -25,6 +25,17 @@ const Direction = {
 };
 
 
+/**
+ * @typedef {Object} Options
+ * @property {string|undefined} className CSS class name.
+ * @property {number|undefined} duration Animation duration in milliseconds. Default is `200`.
+ * @property {number|undefined} maxResolution Maximum resolution.
+ * @property {number|undefined} minResolution Minimum resolution.
+ * @property {function(ol.MapEvent)|undefined} render Function called when the control
+ * should be re-rendered. This is called in a `requestAnimationFrame` callback.
+ */
+
+
 /**
  * @classdesc
  * A slider type of control for zooming.
@@ -35,7 +46,7 @@ const Direction = {
  *
  * @constructor
  * @extends {ol.control.Control}
- * @param {olx.control.ZoomSliderOptions=} opt_options Zoom slider options.
+ * @param {module:ol/control/ZoomSlider~Options=} opt_options Zoom slider options.
  * @api
  */
 const ZoomSlider = function(opt_options) {