diff --git a/src/ol/control/MousePosition.js b/src/ol/control/MousePosition.js
index 23c77387f1..6b0dfcf870 100644
--- a/src/ol/control/MousePosition.js
+++ b/src/ol/control/MousePosition.js
@@ -23,7 +23,7 @@ const COORDINATE_FORMAT = 'coordinateFormat';
  * @typedef {Object} Options
  * @property {string} [className='ol-mouse-position'] CSS class name.
  * @property {import("../coordinate.js").CoordinateFormat} [coordinateFormat] Coordinate format.
- * @property {import("../proj.js").ProjectionLike} projection Projection.
+ * @property {import("../proj.js").ProjectionLike} [projection] Projection. Default is the view projection.
  * @property {function(import("../MapEvent.js").default)} [render] Function called when the
  * control should be re-rendered. This is called in a `requestAnimationFrame`
  * callback.
diff --git a/src/ol/control/ScaleLine.js b/src/ol/control/ScaleLine.js
index 2e8b163136..1aacaa20f4 100644
--- a/src/ol/control/ScaleLine.js
+++ b/src/ol/control/ScaleLine.js
@@ -121,22 +121,19 @@ class ScaleLine extends Control {
       this, getChangeEventType(UNITS_PROP),
       this.handleUnitsChanged_, this);
 
-    this.setUnits(/** @type {Units} */ (options.units) ||
-        Units.METRIC);
+    this.setUnits(/** @type {Units} */ (options.units) || Units.METRIC);
 
   }
 
   /**
    * Return the units to use in the scale line.
-   * @return {Units|undefined} The units
+   * @return {Units} The units
    * to use in the scale line.
    * @observable
    * @api
    */
   getUnits() {
-    return (
-      /** @type {Units|undefined} */ (this.get(UNITS_PROP))
-    );
+    return this.get(UNITS_PROP);
   }
 
   /**