diff --git a/src/ol/control/zoomcontrol.js b/src/ol/control/zoomcontrol.js
index f31b6aaa66..5c8fe4ca4a 100644
--- a/src/ol/control/zoomcontrol.js
+++ b/src/ol/control/zoomcontrol.js
@@ -2,10 +2,12 @@
 
 goog.provide('ol.control.Zoom');
 
+goog.require('goog.asserts');
 goog.require('goog.dom');
 goog.require('goog.dom.TagName');
 goog.require('goog.events');
 goog.require('goog.events.EventType');
+goog.require('ol.View2D');
 goog.require('ol.animation');
 goog.require('ol.control.Control');
 goog.require('ol.css');
@@ -77,8 +79,11 @@ ol.control.Zoom.prototype.zoomByDelta_ = function(delta, browserEvent) {
   browserEvent.preventDefault();
   var map = this.getMap();
   // FIXME works for View2D only
-  var view = map.getView().getView2D();
-  var currentResolution = view.getResolution();
+  var view = map.getView();
+  goog.asserts.assert(goog.isDef(view));
+  var view2D = view.getView2D();
+  goog.asserts.assertInstanceof(view2D, ol.View2D);
+  var currentResolution = view2D.getResolution();
   if (goog.isDef(currentResolution)) {
     if (this.duration_ > 0) {
       map.beforeRender(ol.animation.zoom({
@@ -87,7 +92,7 @@ ol.control.Zoom.prototype.zoomByDelta_ = function(delta, browserEvent) {
         easing: ol.easing.easeOut
       }));
     }
-    var newResolution = view.constrainResolution(currentResolution, delta);
-    view.setResolution(newResolution);
+    var newResolution = view2D.constrainResolution(currentResolution, delta);
+    view2D.setResolution(newResolution);
   }
 };