diff --git a/externs/olx.js b/externs/olx.js
index a6ed968a46..7962f2eaf8 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -5,58 +5,6 @@
 let olx;
 
 
-/**
- * @typedef {{className: (string|undefined),
- *     minWidth: (number|undefined),
- *     render: (function(ol.MapEvent)|undefined),
- *     target: (Element|string|undefined),
- *     units: (ol.control.ScaleLineUnits|string|undefined)}}
- */
-olx.control.ScaleLineOptions;
-
-
-/**
- * CSS Class name. Default is `ol-scale-line`.
- * @type {string|undefined}
- * @api
- */
-olx.control.ScaleLineOptions.prototype.className;
-
-
-/**
- * Minimum width in pixels. Default is `64`.
- * @type {number|undefined}
- * @api
- */
-olx.control.ScaleLineOptions.prototype.minWidth;
-
-
-/**
- * Function called when the control should be re-rendered. This is called
- * in a requestAnimationFrame callback.
- * @type {function(ol.MapEvent)|undefined}
- * @api
- */
-olx.control.ScaleLineOptions.prototype.render;
-
-
-/**
- * Specify a target if you want the control to be rendered outside of the map's
- * viewport.
- * @type {Element|string|undefined}
- * @api
- */
-olx.control.ScaleLineOptions.prototype.target;
-
-
-/**
- * Units. Default is `metric`.
- * @type {ol.control.ScaleLineUnits|string|undefined}
- * @api
- */
-olx.control.ScaleLineOptions.prototype.units;
-
-
 /**
  * @typedef {{duration: (number|undefined),
  *     className: (string|undefined),
diff --git a/externs/xol.js b/externs/xol.js
index eaaf01a57f..d59ab43254 100644
--- a/externs/xol.js
+++ b/externs/xol.js
@@ -1,16 +1,4 @@
 
-/**
- * @typedef {Object} control_ScaleLineOptions
- * @property {string|undefined} className CSS Class name. Default is `ol-scale-line`.
- * @property {number|undefined} minWidth Minimum width in pixels. Default is `64`.
- * @property {function(ol.MapEvent)|undefined} render Function called when the control should be re-rendered. This is called
- * in a requestAnimationFrame callback.
- * @property {Element|string|undefined} target Specify a target if you want the control to be rendered outside of the map's
- * viewport.
- * @property {ol.control.ScaleLineUnits|string|undefined} units Units. Default is `metric`.
- */
-
-
 /**
  * @typedef {Object} control_RotateOptions
  * @property {string|undefined} className CSS class name. Default is `ol-rotate`.
diff --git a/src/ol/control/ScaleLine.js b/src/ol/control/ScaleLine.js
index 15efa83991..3de1e823f5 100644
--- a/src/ol/control/ScaleLine.js
+++ b/src/ol/control/ScaleLine.js
@@ -25,6 +25,18 @@ const UNITS = 'units';
 const LEADING_DIGITS = [1, 2, 5];
 
 
+/**
+ * @typedef {Object} Options
+ * @property {string|undefined} className CSS Class name. Default is `'ol-scale-line'`.
+ * @property {number|undefined} minWidth Minimum width in pixels. Default is `64`.
+ * @property {function(ol.MapEvent)|undefined} render Function called when the control
+ * should be re-rendered. This is called in a `requestAnimationFrame` callback.
+ * @property {Element|string|undefined} target Specify a target if you want the control
+ * to be rendered outside of the map's viewport.
+ * @property {ol.control.ScaleLineUnits|string|undefined} units Units. Default is `'metric'`.
+ */
+
+
 /**
  * @classdesc
  * A control displaying rough y-axis distances, calculated for the center of the
@@ -37,7 +49,7 @@ const LEADING_DIGITS = [1, 2, 5];
  *
  * @constructor
  * @extends {ol.control.Control}
- * @param {olx.control.ScaleLineOptions=} opt_options Scale line options.
+ * @param {module:ol/control/ScaleLine~Options=} opt_options Scale line options.
  * @api
  */
 const ScaleLine = function(opt_options) {