diff --git a/src/ol/control/fullscreencontrol.js b/src/ol/control/fullscreencontrol.js
index 83b653e804..f01402efb2 100644
--- a/src/ol/control/fullscreencontrol.js
+++ b/src/ol/control/fullscreencontrol.js
@@ -46,7 +46,8 @@ ol.control.FullScreen = function(opt_options) {
 
   var button = goog.dom.createDom(goog.dom.TagName.BUTTON, {
     'class': this.cssClassName_ + '-' + goog.dom.fullscreen.isFullScreen() +
-        ' ol-has-tooltip'
+        ' ol-has-tooltip',
+    'type': 'button'
   });
   goog.dom.appendChild(button, tip);
   var buttonHandler = new ol.pointer.PointerEventHandler(button);
diff --git a/src/ol/control/zoomtoextentcontrol.js b/src/ol/control/zoomtoextentcontrol.js
index 441c939878..7f92fe8ae1 100644
--- a/src/ol/control/zoomtoextentcontrol.js
+++ b/src/ol/control/zoomtoextentcontrol.js
@@ -39,7 +39,8 @@ ol.control.ZoomToExtent = function(opt_options) {
     'role' : 'tooltip'
   }, tipLabel);
   var button = goog.dom.createDom(goog.dom.TagName.BUTTON, {
-    'class': 'ol-has-tooltip'
+    'class': 'ol-has-tooltip',
+    'type': 'button'
   });
   goog.dom.appendChild(button, tip);