diff --git a/src/ol/interaction/Draw.js b/src/ol/interaction/Draw.js
index 7f0a1e5935..2c136c0028 100644
--- a/src/ol/interaction/Draw.js
+++ b/src/ol/interaction/Draw.js
@@ -19,7 +19,7 @@ import LineString from '../geom/LineString.js';
 import MultiLineString from '../geom/MultiLineString.js';
 import MultiPoint from '../geom/MultiPoint.js';
 import MultiPolygon from '../geom/MultiPolygon.js';
-import MouseSource from '../pointer/MouseSource.js';
+import {POINTER_TYPE} from '../pointer/MouseSource.js';
 import Point from '../geom/Point.js';
 import Polygon, {fromCircle, makeRegular} from '../geom/Polygon.js';
 import PointerInteraction, {handleEvent as handlePointerEvent} from '../interaction/Pointer.js';
@@ -435,7 +435,7 @@ export function handleEvent(event) {
     pass = event.type === MapBrowserEventType.POINTERMOVE;
     if (pass && this.freehand_) {
       pass = this.handlePointerMove_(event);
-    } else if (event.pointerEvent.pointerType == MouseSource.POINTER_TYPE ||
+    } else if (event.pointerEvent.pointerType == POINTER_TYPE ||
         (event.type === MapBrowserEventType.POINTERDRAG && !this.downTimeout_)) {
       this.handlePointerMove_(event);
     }
diff --git a/src/ol/pointer/MouseSource.js b/src/ol/pointer/MouseSource.js
index 7a5734ad55..dfec1826ae 100644
--- a/src/ol/pointer/MouseSource.js
+++ b/src/ol/pointer/MouseSource.js
@@ -74,7 +74,7 @@ export const POINTER_ID = 1;
 /**
  * @type {string}
  */
-const POINTER_TYPE = 'mouse';
+export const POINTER_TYPE = 'mouse';
 
 
 /**
diff --git a/src/ol/pointer/PointerEvent.js b/src/ol/pointer/PointerEvent.js
index c5688490a1..f0d2d3017f 100644
--- a/src/ol/pointer/PointerEvent.js
+++ b/src/ol/pointer/PointerEvent.js
@@ -199,7 +199,7 @@ inherits(PointerEvent, Event);
  * Is the `buttons` property supported?
  * @type {boolean}
  */
-const HAS_BUTTONS = false;
+let HAS_BUTTONS = false;
 
 
 /**
@@ -269,7 +269,7 @@ PointerEvent.prototype.getPressure_ = function(eventDict, buttons) {
 (function() {
   try {
     const ev = new MouseEvent('click', {buttons: 1});
-    PointerEvent.HAS_BUTTONS = ev.buttons === 1;
+    HAS_BUTTONS = ev.buttons === 1;
   } catch (e) {
     // pass
   }