diff --git a/src/ol/control/ScaleLine.js b/src/ol/control/ScaleLine.js
index 9ea269c2a1..b4f91201b7 100644
--- a/src/ol/control/ScaleLine.js
+++ b/src/ol/control/ScaleLine.js
@@ -51,7 +51,7 @@ const DEFAULT_DPI = 25.4 / 0.28;
  * @property {string} [className='ol-scale-line'] CSS Class name.
  * @property {number} [minWidth=64] Minimum width in pixels at the OGC default dpi. The width will be
  * adjusted to match the dpi used.
- * @property {number|undefined} [maxWidth=undefined] Maximum width in pixels at the OGC default dpi. The width will be
+ * @property {number} [maxWidth] Maximum width in pixels at the OGC default dpi. The width will be
  * adjusted to match the dpi used.
  * @property {function(import("../MapEvent.js").default):void} [render] Function called when the control
  * should be re-rendered. This is called in a `requestAnimationFrame` callback.