diff --git a/src/ol/interaction/MouseWheelZoom.js b/src/ol/interaction/MouseWheelZoom.js
index 6fcc526230..81c638dca9 100644
--- a/src/ol/interaction/MouseWheelZoom.js
+++ b/src/ol/interaction/MouseWheelZoom.js
@@ -8,12 +8,8 @@ import {all, always, focusWithTabindex} from '../events/condition.js';
 import {clamp} from '../math.js';
 
 /**
- * @enum {string}
+ * @typedef {'trackpad' | 'wheel'} Mode
  */
-export const Mode = {
-  TRACKPAD: 'trackpad',
-  WHEEL: 'wheel',
-};
 
 /**
  * @typedef {Object} Options
@@ -218,12 +214,12 @@ class MouseWheelZoom extends Interaction {
     }
 
     if (!this.mode_ || now - this.startTime_ > this.trackpadEventGap_) {
-      this.mode_ = Math.abs(delta) < 4 ? Mode.TRACKPAD : Mode.WHEEL;
+      this.mode_ = Math.abs(delta) < 4 ? 'trackpad' : 'wheel';
     }
 
     const view = map.getView();
     if (
-      this.mode_ === Mode.TRACKPAD &&
+      this.mode_ === 'trackpad' &&
       !(view.getConstrainResolution() || this.constrainResolution_)
     ) {
       if (this.trackpadTimeoutId_) {
diff --git a/test/browser/spec/ol/interaction/mousewheelzoom.test.js b/test/browser/spec/ol/interaction/mousewheelzoom.test.js
index 0640478fea..225d4ebd5c 100644
--- a/test/browser/spec/ol/interaction/mousewheelzoom.test.js
+++ b/test/browser/spec/ol/interaction/mousewheelzoom.test.js
@@ -1,14 +1,15 @@
 import Event from '../../../../../src/ol/events/Event.js';
 import Map from '../../../../../src/ol/Map.js';
 import MapBrowserEvent from '../../../../../src/ol/MapBrowserEvent.js';
-import MouseWheelZoom, {
-  Mode,
-} from '../../../../../src/ol/interaction/MouseWheelZoom.js';
+import MouseWheelZoom from '../../../../../src/ol/interaction/MouseWheelZoom.js';
 import View from '../../../../../src/ol/View.js';
 import {DEVICE_PIXEL_RATIO, FIREFOX} from '../../../../../src/ol/has.js';
 
 describe('ol.interaction.MouseWheelZoom', function () {
-  let map, interaction;
+  /** @type {Map} */
+  let map;
+  /** @type {MouseWheelZoom} */
+  let interaction;
 
   beforeEach(function () {
     interaction = new MouseWheelZoom();
@@ -65,7 +66,7 @@ describe('ol.interaction.MouseWheelZoom', function () {
     if (FIREFOX) {
       it('works on Firefox in DOM_DELTA_PIXEL mode (trackpad)', function (done) {
         map.once('postrender', function () {
-          expect(interaction.mode_).to.be(Mode.TRACKPAD);
+          expect(interaction.mode_).to.be('trackpad');
           done();
         });
         const event = new MapBrowserEvent('wheel', map, {
@@ -83,7 +84,7 @@ describe('ol.interaction.MouseWheelZoom', function () {
     if (!FIREFOX) {
       it('works in DOM_DELTA_PIXEL mode (trackpad)', function (done) {
         map.once('postrender', function () {
-          expect(interaction.mode_).to.be(Mode.TRACKPAD);
+          expect(interaction.mode_).to.be('trackpad');
           done();
         });
         const event = new MapBrowserEvent('wheel', map, {