diff --git a/src/ol/interaction/dblclickzoominteraction.js b/src/ol/interaction/dblclickzoominteraction.js
index 5a4946fa77..0b08c0ef58 100644
--- a/src/ol/interaction/dblclickzoominteraction.js
+++ b/src/ol/interaction/dblclickzoominteraction.js
@@ -47,7 +47,7 @@ ol.interaction.DblClickZoom.prototype.handleMapBrowserEvent =
         -this.delta_ : this.delta_;
     // FIXME works for View2D only
     var view = map.getView();
-    goog.asserts.assert(view instanceof ol.View2D);
+    goog.asserts.assertInstanceof(view, ol.View2D);
     view.zoomByDelta(map, delta, anchor,
         ol.interaction.DBLCLICKZOOM_ANIMATION_DURATION);
     mapBrowserEvent.preventDefault();
diff --git a/src/ol/interaction/draginteraction.js b/src/ol/interaction/draginteraction.js
index 9ffd72b8eb..9179a84a04 100644
--- a/src/ol/interaction/draginteraction.js
+++ b/src/ol/interaction/draginteraction.js
@@ -99,24 +99,24 @@ ol.interaction.Drag.prototype.handleMapBrowserEvent =
   var view = map.getView();
   var browserEvent = mapBrowserEvent.browserEvent;
   if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.DOWN) {
-    goog.asserts.assert(browserEvent instanceof goog.events.BrowserEvent);
+    goog.asserts.assertInstanceof(browserEvent, goog.events.BrowserEvent);
     this.handleDown(mapBrowserEvent);
   }
   if (this.dragging_) {
     if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.DRAG) {
-      goog.asserts.assert(browserEvent instanceof goog.events.BrowserEvent);
+      goog.asserts.assertInstanceof(browserEvent, goog.events.BrowserEvent);
       this.deltaX = browserEvent.clientX - this.startX;
       this.deltaY = browserEvent.clientY - this.startY;
       this.handleDrag(mapBrowserEvent);
     } else if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.DRAGEND) {
-      goog.asserts.assert(browserEvent instanceof goog.events.BrowserEvent);
+      goog.asserts.assertInstanceof(browserEvent, goog.events.BrowserEvent);
       this.deltaX = browserEvent.clientX - this.startX;
       this.deltaY = browserEvent.clientY - this.startY;
       this.handleDragEnd(mapBrowserEvent);
       this.dragging_ = false;
     }
   } else if (mapBrowserEvent.type == ol.MapBrowserEvent.EventType.DRAGSTART) {
-    goog.asserts.assert(browserEvent instanceof goog.events.BrowserEvent);
+    goog.asserts.assertInstanceof(browserEvent, goog.events.BrowserEvent);
     this.startX = browserEvent.clientX;
     this.startY = browserEvent.clientY;
     this.deltaX = 0;
diff --git a/src/ol/interaction/dragpaninteraction.js b/src/ol/interaction/dragpaninteraction.js
index ea0b07b81d..02561e4960 100644
--- a/src/ol/interaction/dragpaninteraction.js
+++ b/src/ol/interaction/dragpaninteraction.js
@@ -58,7 +58,7 @@ ol.interaction.DragPan.prototype.handleDrag = function(mapBrowserEvent) {
   var map = mapBrowserEvent.map;
   // FIXME works for View2D only
   var view = map.getView();
-  goog.asserts.assert(view instanceof ol.View2D);
+  goog.asserts.assertInstanceof(view, ol.View2D);
   var resolution = view.getResolution();
   var rotation = view.getRotation();
   var newCenter = [-resolution * this.deltaX, resolution * this.deltaY];
@@ -124,7 +124,7 @@ ol.interaction.DragPan.prototype.handleDown = function(mapBrowserEvent) {
   var map = mapBrowserEvent.map;
   // FIXME works for View2D only
   var view = map.getView();
-  goog.asserts.assert(view instanceof ol.View2D);
+  goog.asserts.assertInstanceof(view, ol.View2D);
   goog.asserts.assert(!goog.isNull(mapBrowserEvent.frameState));
   if (!goog.isNull(this.kineticPreRenderFn_) &&
       map.removePreRenderFunction(this.kineticPreRenderFn_)) {
diff --git a/src/ol/interaction/dragrotateandzoominteraction.js b/src/ol/interaction/dragrotateandzoominteraction.js
index 4f2ffbab8c..1dc1bd79ca 100644
--- a/src/ol/interaction/dragrotateandzoominteraction.js
+++ b/src/ol/interaction/dragrotateandzoominteraction.js
@@ -56,7 +56,7 @@ ol.interaction.DragRotateAndZoom.prototype.handleDrag =
   var magnitude = delta.magnitude();
   // FIXME works for View2D only
   var view = map.getView();
-  goog.asserts.assert(view instanceof ol.View2D);
+  goog.asserts.assertInstanceof(view, ol.View2D);
   map.requestRenderFrame();
   // FIXME the calls to map.rotate and map.zoomToResolution should use
   // map.withFrozenRendering but an assertion fails :-(
diff --git a/src/ol/interaction/dragrotateinteraction.js b/src/ol/interaction/dragrotateinteraction.js
index cfc243d826..aa928d8beb 100644
--- a/src/ol/interaction/dragrotateinteraction.js
+++ b/src/ol/interaction/dragrotateinteraction.js
@@ -52,7 +52,7 @@ ol.interaction.DragRotate.prototype.handleDrag = function(mapBrowserEvent) {
     var delta = theta - this.lastAngle_;
     var view = map.getView();
     // FIXME supports View2D only
-    goog.asserts.assert(view instanceof ol.View2D);
+    goog.asserts.assertInstanceof(view, ol.View2D);
     map.requestRenderFrame();
     view.rotateWithoutConstraints(map, view.getRotation() - delta);
   }
@@ -68,7 +68,7 @@ ol.interaction.DragRotate.prototype.handleDragEnd = function(mapBrowserEvent) {
   var map = mapBrowserEvent.map;
   // FIXME supports View2D only
   var view = map.getView();
-  goog.asserts.assert(view instanceof ol.View2D);
+  goog.asserts.assertInstanceof(view, ol.View2D);
   view.rotate(map, view.getRotation(), undefined,
       ol.interaction.DRAGROTATE_ANIMATION_DURATION);
   view.setHint(ol.ViewHint.INTERACTING, -1);
@@ -85,7 +85,7 @@ ol.interaction.DragRotate.prototype.handleDragStart =
     var map = mapBrowserEvent.map;
     // FIXME supports View2D only
     var view = map.getView();
-    goog.asserts.assert(view instanceof ol.View2D);
+    goog.asserts.assertInstanceof(view, ol.View2D);
     map.requestRenderFrame();
     this.lastAngle_ = undefined;
     view.setHint(ol.ViewHint.INTERACTING, 1);
diff --git a/src/ol/interaction/dragzoominteraction.js b/src/ol/interaction/dragzoominteraction.js
index c6ef59473f..5f5218dbfe 100644
--- a/src/ol/interaction/dragzoominteraction.js
+++ b/src/ol/interaction/dragzoominteraction.js
@@ -69,7 +69,7 @@ ol.interaction.DragZoom.prototype.handleDragEnd =
     map.withFrozenRendering(function() {
       // FIXME works for View2D only
       var view = map.getView();
-      goog.asserts.assert(view instanceof ol.View2D);
+      goog.asserts.assertInstanceof(view, ol.View2D);
       var mapSize = /** @type {ol.Size} */ (map.getSize());
       view.fitExtent(extent, mapSize);
       // FIXME we should preserve rotation
diff --git a/src/ol/interaction/keyboardpaninteraction.js b/src/ol/interaction/keyboardpaninteraction.js
index 87c15347bb..24d86808b9 100644
--- a/src/ol/interaction/keyboardpaninteraction.js
+++ b/src/ol/interaction/keyboardpaninteraction.js
@@ -54,7 +54,7 @@ ol.interaction.KeyboardPan.prototype.handleMapBrowserEvent =
       var map = mapBrowserEvent.map;
       // FIXME works for View2D only
       var view = map.getView();
-      goog.asserts.assert(view instanceof ol.View2D);
+      goog.asserts.assertInstanceof(view, ol.View2D);
       var resolution = view.getResolution();
       var rotation = view.getRotation();
       var mapUnitsDelta = resolution * this.delta_;
diff --git a/src/ol/interaction/keyboardzoominteraction.js b/src/ol/interaction/keyboardzoominteraction.js
index a132841d97..dc4c6d3578 100644
--- a/src/ol/interaction/keyboardzoominteraction.js
+++ b/src/ol/interaction/keyboardzoominteraction.js
@@ -51,7 +51,7 @@ ol.interaction.KeyboardZoom.prototype.handleMapBrowserEvent =
       map.requestRenderFrame();
       // FIXME works for View2D only
       var view = map.getView();
-      goog.asserts.assert(view instanceof ol.View2D);
+      goog.asserts.assertInstanceof(view, ol.View2D);
       view.zoomByDelta(map, delta, undefined,
           ol.interaction.KEYBOARD_ZOOM_DURATION);
       keyEvent.preventDefault();
diff --git a/src/ol/interaction/mousewheelzoominteraction.js b/src/ol/interaction/mousewheelzoominteraction.js
index 2ed15f70c3..c403944eb1 100644
--- a/src/ol/interaction/mousewheelzoominteraction.js
+++ b/src/ol/interaction/mousewheelzoominteraction.js
@@ -77,7 +77,7 @@ ol.interaction.MouseWheelZoom.prototype.handleMapBrowserEvent =
     var map = mapBrowserEvent.map;
     var mouseWheelEvent = /** @type {goog.events.MouseWheelEvent} */
         (mapBrowserEvent.browserEvent);
-    goog.asserts.assert(mouseWheelEvent instanceof goog.events.MouseWheelEvent);
+    goog.asserts.assertInstanceof(mouseWheelEvent, goog.events.MouseWheelEvent);
 
     this.lastAnchor_ = mapBrowserEvent.getCoordinate();
     this.delta_ += mouseWheelEvent.deltaY / 3;
@@ -109,7 +109,7 @@ ol.interaction.MouseWheelZoom.prototype.doZoom_ = function(map) {
 
   // FIXME works for View2D only
   var view = map.getView();
-  goog.asserts.assert(view instanceof ol.View2D);
+  goog.asserts.assertInstanceof(view, ol.View2D);
 
   map.requestRenderFrame();
   view.zoomByDelta(map, -delta, this.lastAnchor_,
diff --git a/src/ol/map.js b/src/ol/map.js
index f78e50f861..c6026a7e7f 100644
--- a/src/ol/map.js
+++ b/src/ol/map.js
@@ -913,7 +913,7 @@ ol.Map.createOptionsInternal = function(options) {
     if (goog.isArray(options.layers)) {
       layers = new ol.Collection(goog.array.clone(options.layers));
     } else {
-      goog.asserts.assert(options.layers instanceof ol.Collection);
+      goog.asserts.assertInstanceof(options.layers, ol.Collection);
       layers = options.layers;
     }
   } else {
diff --git a/src/ol/projection/projection.js b/src/ol/projection/projection.js
index ede75e0442..67068c383a 100644
--- a/src/ol/projection/projection.js
+++ b/src/ol/projection/projection.js
@@ -374,7 +374,7 @@ ol.projection.createProjection = function(projection, defaultCode) {
   } else if (goog.isString(projection)) {
     return ol.projection.get(projection);
   } else {
-    goog.asserts.assert(projection instanceof ol.Projection);
+    goog.asserts.assertInstanceof(projection, ol.Projection);
     return projection;
   }
 };