diff --git a/externs/olx.js b/externs/olx.js
index 50b8b4f5b9..f82ff39c3d 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -1756,12 +1756,6 @@ olx.format.WFSWriteGetFeatureOptions.prototype.maxFeatures;
  */
 olx.format.WFSWriteGetFeatureOptions.prototype.geometryName;
 
-/**
- * GML format to use within the WFS format.
- * @type {ol.format.GMLBase|undefined}
- * @api
- */
-olx.format.WFSWriteGetFeatureOptions.prototype.gmlFormat;
 
 /**
  * Extent to use for the BBOX filter.