diff --git a/src/ol/render/webgl/webglimmediate.js b/src/ol/render/webgl/webglimmediate.js
index 0f5ce82f09..2a8d8e4222 100644
--- a/src/ol/render/webgl/webglimmediate.js
+++ b/src/ol/render/webgl/webglimmediate.js
@@ -13,6 +13,13 @@ ol.render.webgl.Immediate = function(context, pixelRatio) {
 };
 
 
+/**
+ * @inheritDoc
+ */
+ol.render.webgl.Immediate.prototype.drawAsync = function(zIndex, callback) {
+};
+
+
 /**
  * @param {ol.Feature} feature Feature.
  * @param {ol.style.Style} style Style.