diff --git a/src/ol/layer/vectortile.js b/src/ol/layer/vectortile.js
index 0e001e882f..e248a92384 100644
--- a/src/ol/layer/vectortile.js
+++ b/src/ol/layer/vectortile.js
@@ -116,3 +116,12 @@ ol.layer.VectorTile.prototype.setUseInterimTilesOnError = function(useInterimTil
   this.set(
       ol.layer.TileProperty.USE_INTERIM_TILES_ON_ERROR, useInterimTilesOnError);
 };
+
+
+/**
+ * Return the associated {@link ol.source.VectorTile vectortilesource} of the layer.
+ * @function
+ * @return {ol.source.VectorTile} Source.
+ * @api
+ */
+ol.layer.VectorTile.prototype.getSource;