diff --git a/externs/oli.js b/externs/oli.js
index 91ae1d9875..7f1d49940b 100644
--- a/externs/oli.js
+++ b/externs/oli.js
@@ -75,6 +75,23 @@ oli.MapBrowserEvent.prototype.pixel;
 
 
 
+/** @interface */
+oli.MapEvent;
+
+
+/**
+ * @type {ol.Map}
+ */
+oli.MapEvent.prototype.map;
+
+
+/**
+ * @type {olx.FrameState}
+ */
+oli.MapEvent.prototype.frameState;
+
+
+
 /**
  * @interface
  */
@@ -111,6 +128,7 @@ oli.interaction.DragAndDropEvent.prototype.projection;
 oli.interaction.DragAndDropEvent.prototype.file;
 
 
+
 /** @interface */
 oli.render.Event;
 
diff --git a/src/ol/mapevent.js b/src/ol/mapevent.js
index 4ac3bf4fd2..b411a1f7bf 100644
--- a/src/ol/mapevent.js
+++ b/src/ol/mapevent.js
@@ -27,6 +27,7 @@ ol.MapEventType = {
 /**
  * @constructor
  * @extends {goog.events.Event}
+ * @implements {oli.MapEvent}
  * @param {string} type Event type.
  * @param {ol.Map} map Map.
  * @param {?olx.FrameState=} opt_frameState Frame state.