diff --git a/web/client/components/data/featuregrid/FeatureGrid.jsx b/web/client/components/data/featuregrid/FeatureGrid.jsx
index 16ced740c2..c668ac9c1b 100644
--- a/web/client/components/data/featuregrid/FeatureGrid.jsx
+++ b/web/client/components/data/featuregrid/FeatureGrid.jsx
@@ -362,7 +362,7 @@ const FeatureGrid = React.createClass({
         let selectedId = this.props.highlightedFeatures;
         let me = this;
         this.api.forEachNode((n) => {
-            if (selectedId.includes(n.data.id)) {
+            if (selectedId.indexOf(n.data.id) !== -1) {
                 me.api.selectNode(n, true, true);
             }else if (me.api.isNodeSelected(n)) {
                 me.suppresSelectionEvent = true;
diff --git a/web/client/components/map/leaflet/HighlightFeatureSupport.jsx b/web/client/components/map/leaflet/HighlightFeatureSupport.jsx
index 68424a2c4c..ed81627768 100644
--- a/web/client/components/map/leaflet/HighlightFeatureSupport.jsx
+++ b/web/client/components/map/leaflet/HighlightFeatureSupport.jsx
@@ -125,7 +125,7 @@ const HighlightFeatureSupport = React.createClass({
         this._selectedFeatures.map((f) => {this._layer.resetStyle(f); });
         this._selectedFeatures = [];
         this._layer.eachLayer((l)=> {
-            if (features.includes(l.msId)) {
+            if (features.indexOf(l.msId) !== -1) {
                 this._selectedFeatures.push(l);
                 l.bringToFront();
                 l.setStyle(this.props.selectedStyle);
diff --git a/web/client/components/map/openlayers/HighlightFeatureSupport.jsx b/web/client/components/map/openlayers/HighlightFeatureSupport.jsx
index 2f3669c16a..b76c03e2a9 100644
--- a/web/client/components/map/openlayers/HighlightFeatureSupport.jsx
+++ b/web/client/components/map/openlayers/HighlightFeatureSupport.jsx
@@ -152,7 +152,7 @@ const HighlightFeatureSupport = React.createClass({
         if (layer) {
             let ft = layer.getSource().getFeatures();
             ft.map((f)=> {
-                if (features.includes(f.getId())) {
+                if (features.indexOf(f.getId()) !== -1) {
                     ftColl.push(f);
                 }
             }, this);
diff --git a/web/client/components/maps/forms/Thumbnail.jsx b/web/client/components/maps/forms/Thumbnail.jsx
index b5ebbb34ce..9e02c92256 100644
--- a/web/client/components/maps/forms/Thumbnail.jsx
+++ b/web/client/components/maps/forms/Thumbnail.jsx
@@ -158,7 +158,7 @@ const Thumbnail = React.createClass({
         this.getDataUri(this.files, callback);
     },
     deleteThumbnail(thumbnail, mapId) {
-        if (thumbnail && thumbnail.includes("geostore")) {
+        if (thumbnail && thumbnail.indexOf("geostore") !== -1) {
             // this doesn't work if the URL is not encoded (because of GeoStore / Tomcat parameter encoding issues)
             let start = (thumbnail).indexOf("data%2F") + 7;
             let end = (thumbnail).indexOf("%2Fraw");