Line dash not working OL3 (Openlayers 3)

I want to display a dashed line in a vector layer, as the it's shown in the Documentation there is a propriety called lineDash , but it didn't work for me here my code :

 var iconStyle_line = new ol.style.Style({//  My style definition 
          fill: new ol.style.Fill({
          color: 'rgba(221, 99, 0, 0.5)'
          }),
          stroke: new ol.style.Stroke({
          color: 'rgba(221, 99, 0, 0.5)',
          width: 3,
          lineDash: [4]
          })
     });

 var vectorSource_line = new ol.source.Vector();//  My vector source

 var vector_line = new ol.layer.Vector({

         source: vectorSource_line,
         style: iconStyle_det_line 
     });

I appreciate your support on this, thanks in advance,