diff --git a/src/ol/mapbrowserevent.js b/src/ol/mapbrowserevent.js
index b0526c1754..3d7dbd2a25 100644
--- a/src/ol/mapbrowserevent.js
+++ b/src/ol/mapbrowserevent.js
@@ -124,10 +124,11 @@ ol.MapBrowserEventHandler = function(map) {
   this.map_ = map;
 
   /**
-   * @type {Object}
+   * Whether one of the mouse button is pressed.
+   * @type {boolean}
    * @private
    */
-  this.previous_ = null;
+  this.pressed_ = false;
 
   /**
    * @type {boolean}
@@ -231,11 +232,11 @@ ol.MapBrowserEventHandler.prototype.click_ = function(browserEvent) {
  * @private
  */
 ol.MapBrowserEventHandler.prototype.handleMouseUp_ = function(browserEvent) {
-  if (this.previous_) {
+  if (this.pressed_) {
     this.down_ = null;
     goog.array.forEach(this.dragListenerKeys_, goog.events.unlistenByKey);
     this.dragListenerKeys_ = null;
-    this.previous_ = null;
+    this.pressed_ = false;
     if (this.dragged_) {
       var newEvent = new ol.MapBrowserEvent(
           ol.MapBrowserEvent.EventType.DRAGEND, this.map_, browserEvent);
@@ -253,12 +254,9 @@ ol.MapBrowserEventHandler.prototype.handleMouseDown_ = function(browserEvent) {
   var newEvent = new ol.MapBrowserEvent(
       ol.MapBrowserEvent.EventType.DOWN, this.map_, browserEvent);
   this.dispatchEvent(newEvent);
-  if (!this.previous_) {
+  if (!this.pressed_) {
     this.down_ = browserEvent;
-    this.previous_ = {
-      clientX: browserEvent.clientX,
-      clientY: browserEvent.clientY
-    };
+    this.pressed_ = true;
     this.dragged_ = false;
     this.dragListenerKeys_ = [
       goog.events.listen(goog.global.document, goog.events.EventType.MOUSEMOVE,
@@ -284,10 +282,6 @@ ol.MapBrowserEventHandler.prototype.handleMouseMove_ = function(browserEvent) {
         ol.MapBrowserEvent.EventType.DRAGSTART, this.map_, this.down_);
     this.dispatchEvent(newEvent);
   }
-  this.previous_ = {
-    clientX: browserEvent.clientX,
-    clientY: browserEvent.clientY
-  };
   newEvent = new ol.MapBrowserEvent(
       ol.MapBrowserEvent.EventType.DRAG, this.map_, browserEvent);
   this.dispatchEvent(newEvent);