diff --git a/src/leaflet.groupedlayercontrol.js b/src/leaflet.groupedlayercontrol.js
index b1e80d1..41bd643 100644
--- a/src/leaflet.groupedlayercontrol.js
+++ b/src/leaflet.groupedlayercontrol.js
@@ -331,7 +331,7 @@ L.Control.GroupedLayers = L.Control.extend({
 
     for (i = 0; i < inputsLen; i++) {
       input = inputs[i];
-      if (input.className === 'leaflet-control-layers-selector') {
+      if (L.DomUtil.hasClass(input, 'leaflet-control-layers-selector')) {
         obj = this._getLayer(input.layerId);
 
         if (input.checked && !this._map.hasLayer(obj.layer)) {