diff --git a/src/ol/interaction/dragzoominteraction.js b/src/ol/interaction/dragzoominteraction.js
index a5e7a2f75e..96bdc04ce5 100644
--- a/src/ol/interaction/dragzoominteraction.js
+++ b/src/ol/interaction/dragzoominteraction.js
@@ -32,7 +32,7 @@ ol.interaction.DragZoom = function(opt_options) {
    * @private
    * @type {number}
    */
-  this.duration_ = options.duration ? options.duration : 200;
+  this.duration_ = options.duration !== undefined ? options.duration : 200;
 
   /**
    * @private