diff --git a/src/ol/control/fullscreencontrol.js b/src/ol/control/fullscreencontrol.js
index 8126320769..148963850b 100644
--- a/src/ol/control/fullscreencontrol.js
+++ b/src/ol/control/fullscreencontrol.js
@@ -140,7 +140,7 @@ ol.control.FullScreen.prototype.handleFullScreen_ = function() {
 ol.control.FullScreen.prototype.handleFullScreenChange_ = function() {
   var opened = this.cssClassName_ + '-true';
   var closed = this.cssClassName_ + '-false';
-  var button = goog.dom.getFirstElementChild(this.element);
+  var button = this.element.firstElementChild;
   var map = this.getMap();
   if (goog.dom.fullscreen.isFullScreen()) {
     goog.dom.classlist.swap(button, closed, opened);
diff --git a/src/ol/control/zoomslidercontrol.js b/src/ol/control/zoomslidercontrol.js
index e4a968c3c4..1a4859df6e 100644
--- a/src/ol/control/zoomslidercontrol.js
+++ b/src/ol/control/zoomslidercontrol.js
@@ -176,7 +176,7 @@ ol.control.ZoomSlider.prototype.initSlider_ = function() {
   var container = this.element;
   var containerSize = goog.style.getSize(container);
 
-  var thumb = goog.dom.getFirstElementChild(container);
+  var thumb = container.firstElementChild;
   var thumbMargins = goog.style.getMarginBox(thumb);
   var thumbBorderBoxSize = goog.style.getBorderBoxSize(thumb);
   var thumbWidth = thumbBorderBoxSize.width +
@@ -328,7 +328,7 @@ ol.control.ZoomSlider.prototype.handleDraggerEnd_ = function(event) {
  */
 ol.control.ZoomSlider.prototype.setThumbPosition_ = function(res) {
   var position = this.getPositionForResolution_(res);
-  var thumb = goog.dom.getFirstElementChild(this.element);
+  var thumb = this.element.firstElementChild;
 
   if (this.direction_ == ol.control.ZoomSlider.direction.HORIZONTAL) {
     thumb.style.left = this.widthLimit_ * position + 'px';