diff --git a/externs/oli.js b/externs/oli.js
index 731886a2d8..9e4d5632fe 100644
--- a/externs/oli.js
+++ b/externs/oli.js
@@ -18,6 +18,16 @@ oli.CollectionEvent = function() {};
 oli.CollectionEvent.prototype.element;
 
 
+
+/** @interface */
+oli.DragBoxEvent;
+
+
+/** @type {ol.Coordinate} */
+oli.DragBoxEvent.prototype.coordinate;
+
+
+
 /** @interface */
 oli.DrawEvent;
 
diff --git a/src/ol/interaction/dragboxinteraction.exports b/src/ol/interaction/dragboxinteraction.exports
index 7553395958..7b578e067a 100644
--- a/src/ol/interaction/dragboxinteraction.exports
+++ b/src/ol/interaction/dragboxinteraction.exports
@@ -1,4 +1,2 @@
 @exportSymbol ol.interaction.DragBox
 @exportProperty ol.interaction.DragBox.prototype.getGeometry
-
-@exportProperty ol.DragBoxEvent.prototype.getCoordinate
diff --git a/src/ol/interaction/dragboxinteraction.js b/src/ol/interaction/dragboxinteraction.js
index 44cdf04267..f12f1c2f7c 100644
--- a/src/ol/interaction/dragboxinteraction.js
+++ b/src/ol/interaction/dragboxinteraction.js
@@ -44,30 +44,22 @@ ol.DragBoxEventType = {
  * @param {ol.Coordinate} coordinate The event coordinate.
  * @extends {goog.events.Event}
  * @constructor
+ * @implements {oli.DragBoxEvent}
  */
 ol.DragBoxEvent = function(type, coordinate) {
   goog.base(this, type);
 
   /**
    * The coordinate of the drag event.
+   * @const
    * @type {ol.Coordinate}
-   * @private
    */
-  this.coordinate_ = coordinate;
+  this.coordinate = coordinate;
 
 };
 goog.inherits(ol.DragBoxEvent, goog.events.Event);
 
 
-/**
- * Get the name of the property associated with this event.
- * @return {ol.Coordinate} Event coordinate.
- */
-ol.DragBoxEvent.prototype.getCoordinate = function() {
-  return this.coordinate_;
-};
-
-
 
 /**
  * @constructor