diff --git a/src/ol/control/attributioncontrol.js b/src/ol/control/attributioncontrol.js
index 7795f29cfa..4ec528b2b3 100644
--- a/src/ol/control/attributioncontrol.js
+++ b/src/ol/control/attributioncontrol.js
@@ -64,11 +64,11 @@ ol.control.Attribution = function(opt_options) {
     this.collapsed_ = false;
   }
 
-  var className = options.className ? options.className : 'ol-attribution';
+  var className = options.className !== undefined ? options.className : 'ol-attribution';
 
-  var tipLabel = options.tipLabel ? options.tipLabel : 'Attributions';
+  var tipLabel = options.tipLabel !== undefined ? options.tipLabel : 'Attributions';
 
-  var collapseLabel = options.collapseLabel ? options.collapseLabel : '\u00BB';
+  var collapseLabel = options.collapseLabel !== undefined ? options.collapseLabel : '\u00BB';
 
   /**
    * @private
@@ -78,7 +78,7 @@ ol.control.Attribution = function(opt_options) {
       goog.dom.createDom('SPAN', {}, collapseLabel) :
       collapseLabel;
 
-  var label = options.label ? options.label : 'i';
+  var label = options.label !== undefined ? options.label : 'i';
 
   /**
    * @private
diff --git a/src/ol/control/fullscreencontrol.js b/src/ol/control/fullscreencontrol.js
index 0086d93339..8126320769 100644
--- a/src/ol/control/fullscreencontrol.js
+++ b/src/ol/control/fullscreencontrol.js
@@ -37,9 +37,10 @@ ol.control.FullScreen = function(opt_options) {
    * @private
    * @type {string}
    */
-  this.cssClassName_ = options.className ? options.className : 'ol-full-screen';
+  this.cssClassName_ = options.className !== undefined ? options.className :
+      'ol-full-screen';
 
-  var label = options.label ? options.label : '\u2922';
+  var label = options.label !== undefined ? options.label : '\u2922';
 
   /**
    * @private
@@ -48,7 +49,7 @@ ol.control.FullScreen = function(opt_options) {
   this.labelNode_ = typeof label === 'string' ?
       document.createTextNode(label) : label;
 
-  var labelActive = options.labelActive ? options.labelActive : '\u00d7';
+  var labelActive = options.labelActive !== undefined ? options.labelActive : '\u00d7';
 
   /**
    * @private
diff --git a/src/ol/control/mousepositioncontrol.js b/src/ol/control/mousepositioncontrol.js
index 7a558a042a..bb8e2a01d8 100644
--- a/src/ol/control/mousepositioncontrol.js
+++ b/src/ol/control/mousepositioncontrol.js
@@ -40,7 +40,8 @@ ol.control.MousePosition = function(opt_options) {
 
   var options = opt_options ? opt_options : {};
 
-  var className = options.className ? options.className : 'ol-mouse-position';
+  var className = options.className !== undefined ? options.className :
+      'ol-mouse-position';
 
   var element = goog.dom.createDom('DIV', className);
 
@@ -68,7 +69,7 @@ ol.control.MousePosition = function(opt_options) {
    * @private
    * @type {string}
    */
-  this.undefinedHTML_ = options.undefinedHTML ? options.undefinedHTML : '';
+  this.undefinedHTML_ = options.undefinedHTML !== undefined ? options.undefinedHTML : '';
 
   /**
    * @private
diff --git a/src/ol/control/overviewmapcontrol.js b/src/ol/control/overviewmapcontrol.js
index f050779dc9..020fc25d21 100644
--- a/src/ol/control/overviewmapcontrol.js
+++ b/src/ol/control/overviewmapcontrol.js
@@ -52,11 +52,11 @@ ol.control.OverviewMap = function(opt_options) {
     this.collapsed_ = false;
   }
 
-  var className = options.className ? options.className : 'ol-overviewmap';
+  var className = options.className !== undefined ? options.className : 'ol-overviewmap';
 
-  var tipLabel = options.tipLabel ? options.tipLabel : 'Overview map';
+  var tipLabel = options.tipLabel !== undefined ? options.tipLabel : 'Overview map';
 
-  var collapseLabel = options.collapseLabel ? options.collapseLabel : '\u00AB';
+  var collapseLabel = options.collapseLabel !== undefined ? options.collapseLabel : '\u00AB';
 
   /**
    * @private
@@ -66,7 +66,7 @@ ol.control.OverviewMap = function(opt_options) {
       goog.dom.createDom('SPAN', {}, collapseLabel) :
       collapseLabel;
 
-  var label = options.label ? options.label : '\u00BB';
+  var label = options.label !== undefined ? options.label : '\u00BB';
 
   /**
    * @private
diff --git a/src/ol/control/rotatecontrol.js b/src/ol/control/rotatecontrol.js
index 38e1375bde..e71f3c31c8 100644
--- a/src/ol/control/rotatecontrol.js
+++ b/src/ol/control/rotatecontrol.js
@@ -26,9 +26,9 @@ ol.control.Rotate = function(opt_options) {
 
   var options = opt_options ? opt_options : {};
 
-  var className = options.className ? options.className : 'ol-rotate';
+  var className = options.className !== undefined ? options.className : 'ol-rotate';
 
-  var label = options.label ? options.label : '\u21E7';
+  var label = options.label !== undefined ? options.label : '\u21E7';
 
   /**
    * @type {Element}
diff --git a/src/ol/control/scalelinecontrol.js b/src/ol/control/scalelinecontrol.js
index 8cb122c6bd..7de1873943 100644
--- a/src/ol/control/scalelinecontrol.js
+++ b/src/ol/control/scalelinecontrol.js
@@ -55,7 +55,7 @@ ol.control.ScaleLine = function(opt_options) {
 
   var options = opt_options ? opt_options : {};
 
-  var className = options.className ? options.className : 'ol-scale-line';
+  var className = options.className !== undefined ? options.className : 'ol-scale-line';
 
   /**
    * @private
diff --git a/src/ol/control/zoomcontrol.js b/src/ol/control/zoomcontrol.js
index 7574fc4c2f..e840c66c24 100644
--- a/src/ol/control/zoomcontrol.js
+++ b/src/ol/control/zoomcontrol.js
@@ -24,16 +24,16 @@ ol.control.Zoom = function(opt_options) {
 
   var options = opt_options ? opt_options : {};
 
-  var className = options.className ? options.className : 'ol-zoom';
+  var className = options.className !== undefined ? options.className : 'ol-zoom';
 
-  var delta = options.delta ? options.delta : 1;
+  var delta = options.delta !== undefined ? options.delta : 1;
 
-  var zoomInLabel = options.zoomInLabel ? options.zoomInLabel : '+';
-  var zoomOutLabel = options.zoomOutLabel ? options.zoomOutLabel : '\u2212';
+  var zoomInLabel = options.zoomInLabel !== undefined ? options.zoomInLabel : '+';
+  var zoomOutLabel = options.zoomOutLabel !== undefined ? options.zoomOutLabel : '\u2212';
 
-  var zoomInTipLabel = options.zoomInTipLabel ?
+  var zoomInTipLabel = options.zoomInTipLabel !== undefined ?
       options.zoomInTipLabel : 'Zoom in';
-  var zoomOutTipLabel = options.zoomOutTipLabel ?
+  var zoomOutTipLabel = options.zoomOutTipLabel !== undefined ?
       options.zoomOutTipLabel : 'Zoom out';
 
   var inElement = goog.dom.createDom('BUTTON', {
diff --git a/src/ol/control/zoomslidercontrol.js b/src/ol/control/zoomslidercontrol.js
index a68dc1a140..8af69d8a2c 100644
--- a/src/ol/control/zoomslidercontrol.js
+++ b/src/ol/control/zoomslidercontrol.js
@@ -98,7 +98,7 @@ ol.control.ZoomSlider = function(opt_options) {
    */
   this.duration_ = options.duration !== undefined ? options.duration : 200;
 
-  var className = options.className ? options.className : 'ol-zoomslider';
+  var className = options.className !== undefined ? options.className : 'ol-zoomslider';
   var thumbElement = goog.dom.createDom('BUTTON', {
     'type': 'button',
     'class': className + '-thumb ' + ol.css.CLASS_UNSELECTABLE
diff --git a/src/ol/control/zoomtoextentcontrol.js b/src/ol/control/zoomtoextentcontrol.js
index 28be2a3be1..017850bb78 100644
--- a/src/ol/control/zoomtoextentcontrol.js
+++ b/src/ol/control/zoomtoextentcontrol.js
@@ -27,11 +27,11 @@ ol.control.ZoomToExtent = function(opt_options) {
    */
   this.extent_ = options.extent ? options.extent : null;
 
-  var className = options.className ? options.className :
+  var className = options.className !== undefined ? options.className :
       'ol-zoom-extent';
 
-  var label = options.label ? options.label : 'E';
-  var tipLabel = options.tipLabel ?
+  var label = options.label !== undefined ? options.label : 'E';
+  var tipLabel = options.tipLabel !== undefined ?
       options.tipLabel : 'Fit to extent';
   var button = goog.dom.createDom('BUTTON', {
     'type': 'button',