diff --git a/lib/OpenLayers/Tile/WFS.js b/lib/OpenLayers/Tile/WFS.js
index 27535fe4fb..67ed6d5a45 100644
--- a/lib/OpenLayers/Tile/WFS.js
+++ b/lib/OpenLayers/Tile/WFS.js
@@ -133,7 +133,7 @@ OpenLayers.Tile.WFS = OpenLayers.Class(OpenLayers.Tile, {
                 doc = OpenLayers.parseXMLString(request.responseText);
             }
             if (this.layer.vectorMode) {
-                this.layer.addFeatures(this.formatObject.read(doc));
+                this.layer.addFeatures(this.layer.formatObject.read(doc));
             } else {
                 var resultFeatures = OpenLayers.Ajax.getElementsByTagNameNS(
                     doc, "http://www.opengis.net/gml", "gml", "featureMember"