diff --git a/src/ol/format/wmsgetfeatureinfo.js b/src/ol/format/wmsgetfeatureinfo.js
index 6f731d8d90..2fcb6fd62b 100644
--- a/src/ol/format/wmsgetfeatureinfo.js
+++ b/src/ol/format/wmsgetfeatureinfo.js
@@ -145,3 +145,24 @@ ol.format.WMSGetFeatureInfo.prototype.readFeaturesFromNode = function(node, opt_
   }
   return this.readFeatures_(node, [options]);
 };
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.WMSGetFeatureInfo.prototype.writeFeatureNode = function(feature, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.WMSGetFeatureInfo.prototype.writeFeaturesNode = function(features, opt_options) {};
+
+
+/**
+ * Not implemented.
+ * @inheritDoc
+ */
+ol.format.WMSGetFeatureInfo.prototype.writeGeometryNode = function(geometry, opt_options) {};