diff --git a/js/plugin/Routing.js b/js/plugin/Routing.js
index 4627a15..fb08176 100644
--- a/js/plugin/Routing.js
+++ b/js/plugin/Routing.js
@@ -371,7 +371,7 @@ BR.Routing = L.Routing.extend({
         this._removeDistanceMarkers();
 
         if (this._map) {
-            let distanceMarkersOpts = this.options.distanceMarkers || {};
+            var distanceMarkersOpts = this.options.distanceMarkers || {};
             this._distanceMarkers = new L.DistanceMarkers(this.toPolyline(), this._map, distanceMarkersOpts);
             this._map.addLayer(this._distanceMarkers);
         }
diff --git a/js/plugin/leaflet-distance-marker.js b/js/plugin/leaflet-distance-marker.js
index 452d733..f536a2e 100644
--- a/js/plugin/leaflet-distance-marker.js
+++ b/js/plugin/leaflet-distance-marker.js
@@ -110,7 +110,7 @@ L.DistanceMarkers = L.LayerGroup.extend({
             l = keys.length;
 
         for (i = 0; i < l; ++i) {
-            let zoomLayer = this._zoomLayers[keys[i]];
+            var zoomLayer = this._zoomLayers[keys[i]];
             zoomLayer.eachLayer(function(layer) {
                 layer.setOpacity(opacity);
             });
@@ -118,8 +118,8 @@ L.DistanceMarkers = L.LayerGroup.extend({
     },
 
     _minimumZoomLevelForItem: function(item, showAllLevel) {
-        var zoom = showAllLevel;
-        var i = item;
+        var zoom = showAllLevel,
+            i = item;
         while (i > 0 && i % 2 === 0) {
             --zoom;
             i = Math.floor(i / 2);