diff --git a/src/ol/geom/flat/geodesicflatgeom.js b/src/ol/geom/flat/geodesicflatgeom.js
index 3054f9f8c6..6ad3d62881 100644
--- a/src/ol/geom/flat/geodesicflatgeom.js
+++ b/src/ol/geom/flat/geodesicflatgeom.js
@@ -1,7 +1,6 @@
 goog.provide('ol.geom.flat.geodesic');
 
 goog.require('goog.asserts');
-goog.require('goog.object');
 goog.require('ol.TransformFunction');
 goog.require('ol.math');
 goog.require('ol.proj');
@@ -49,7 +48,7 @@ ol.geom.flat.geodesic.line_ =
     a = stack.pop();
     // Add the a coordinate if it has not been added yet
     key = fracA.toString();
-    if (!goog.object.containsKey(fractions, key)) {
+    if (!(key in fractions)) {
       flatCoordinates.push(a[0], a[1]);
       fractions[key] = true;
     }
@@ -68,7 +67,7 @@ ol.geom.flat.geodesic.line_ =
       // segment.
       flatCoordinates.push(b[0], b[1]);
       key = fracB.toString();
-      goog.asserts.assert(!goog.object.containsKey(fractions, key),
+      goog.asserts.assert(!(key in fractions),
           'fractions object should contain key : ' + key);
       fractions[key] = true;
     } else {
diff --git a/src/ol/pointer/touchsource.js b/src/ol/pointer/touchsource.js
index 032ebaef85..baeeee5341 100644
--- a/src/ol/pointer/touchsource.js
+++ b/src/ol/pointer/touchsource.js
@@ -126,8 +126,8 @@ ol.pointer.TouchSource.prototype.isPrimaryTouch_ = function(inTouch) {
  */
 ol.pointer.TouchSource.prototype.setPrimaryTouch_ = function(inTouch) {
   var count = goog.object.getCount(this.pointerMap);
-  if (count === 0 || (count === 1 && goog.object.containsKey(this.pointerMap,
-      ol.pointer.MouseSource.POINTER_ID.toString()))) {
+  if (count === 0 || (count === 1 &&
+      ol.pointer.MouseSource.POINTER_ID.toString() in this.pointerMap)) {
     this.firstTouchId_ = inTouch.identifier;
     this.cancelResetClickCount_();
   }
diff --git a/src/ol/proj/proj.js b/src/ol/proj/proj.js
index 88e95593f8..4501e60c14 100644
--- a/src/ol/proj/proj.js
+++ b/src/ol/proj/proj.js
@@ -511,7 +511,7 @@ ol.proj.addTransform = function(source, destination, transformFn) {
   var sourceCode = source.getCode();
   var destinationCode = destination.getCode();
   var transforms = ol.proj.transforms_;
-  if (!goog.object.containsKey(transforms, sourceCode)) {
+  if (!(sourceCode in transforms)) {
     transforms[sourceCode] = {};
   }
   transforms[sourceCode][destinationCode] = transformFn;
@@ -720,8 +720,7 @@ ol.proj.getTransformFromProjections =
   var sourceCode = sourceProjection.getCode();
   var destinationCode = destinationProjection.getCode();
   var transform;
-  if (goog.object.containsKey(transforms, sourceCode) &&
-      goog.object.containsKey(transforms[sourceCode], destinationCode)) {
+  if (sourceCode in transforms && destinationCode in transforms[sourceCode]) {
     transform = transforms[sourceCode][destinationCode];
   }
   if (transform === undefined) {
diff --git a/src/ol/render/webgl/webglreplay.js b/src/ol/render/webgl/webglreplay.js
index 9534570587..d20ca89279 100644
--- a/src/ol/render/webgl/webglreplay.js
+++ b/src/ol/render/webgl/webglreplay.js
@@ -478,7 +478,7 @@ ol.render.webgl.ImageReplay.prototype.createTextures_ =
     image = images[i];
 
     uid = goog.getUid(image).toString();
-    if (goog.object.containsKey(texturePerImage, uid)) {
+    if (uid in texturePerImage) {
       texture = texturePerImage[uid];
     } else {
       texture = ol.webgl.Context.createTexture(
diff --git a/src/ol/source/clustersource.js b/src/ol/source/clustersource.js
index 4cf2ca0c6c..9fdc5f4326 100644
--- a/src/ol/source/clustersource.js
+++ b/src/ol/source/clustersource.js
@@ -118,7 +118,7 @@ ol.source.Cluster.prototype.cluster_ = function() {
 
   for (var i = 0, ii = features.length; i < ii; i++) {
     var feature = features[i];
-    if (!goog.object.containsKey(clustered, goog.getUid(feature).toString())) {
+    if (!(goog.getUid(feature).toString() in clustered)) {
       var geometry = feature.getGeometry();
       goog.asserts.assert(geometry instanceof ol.geom.Point,
           'feature geometry is a ol.geom.Point instance');
@@ -130,7 +130,7 @@ ol.source.Cluster.prototype.cluster_ = function() {
       goog.asserts.assert(neighbors.length >= 1, 'at least one neighbor found');
       neighbors = neighbors.filter(function(neighbor) {
         var uid = goog.getUid(neighbor).toString();
-        if (!goog.object.containsKey(clustered, uid)) {
+        if (!(uid in clustered)) {
           clustered[uid] = true;
           return true;
         } else {
diff --git a/src/ol/structs/rbush.js b/src/ol/structs/rbush.js
index 41c6d2cd20..987a208428 100644
--- a/src/ol/structs/rbush.js
+++ b/src/ol/structs/rbush.js
@@ -59,8 +59,7 @@ ol.structs.RBush.prototype.insert = function(extent, value) {
   ];
   this.rbush_.insert(item);
   // remember the object that was added to the internal rbush
-  goog.asserts.assert(
-      !goog.object.containsKey(this.items_, goog.getUid(value)),
+  goog.asserts.assert(!(goog.getUid(value) in this.items_),
       'uid (%s) of value (%s) already exists', goog.getUid(value), value);
   this.items_[goog.getUid(value)] = item;
 };
@@ -92,8 +91,7 @@ ol.structs.RBush.prototype.load = function(extents, values) {
       value
     ];
     items[i] = item;
-    goog.asserts.assert(
-        !goog.object.containsKey(this.items_, goog.getUid(value)),
+    goog.asserts.assert(!(goog.getUid(value) in this.items_),
         'uid (%s) of value (%s) already exists', goog.getUid(value), value);
     this.items_[goog.getUid(value)] = item;
   }
@@ -111,7 +109,7 @@ ol.structs.RBush.prototype.remove = function(value) {
     throw new Error('Can not remove value while reading');
   }
   var uid = goog.getUid(value);
-  goog.asserts.assert(goog.object.containsKey(this.items_, uid),
+  goog.asserts.assert(uid in this.items_,
       'uid (%s) of value (%s) does not exist', uid, value);
 
   // get the object in which the value was wrapped when adding to the
@@ -129,7 +127,7 @@ ol.structs.RBush.prototype.remove = function(value) {
  */
 ol.structs.RBush.prototype.update = function(extent, value) {
   var uid = goog.getUid(value);
-  goog.asserts.assert(goog.object.containsKey(this.items_, uid),
+  goog.asserts.assert(uid in this.items_,
       'uid (%s) of value (%s) does not exist', uid, value);
 
   var item = this.items_[uid];