diff --git a/src/ol/exports.txt b/src/ol/exports.txt
index cea5105990..6b6d09418c 100644
--- a/src/ol/exports.txt
+++ b/src/ol/exports.txt
@@ -1,3 +1,5 @@
+@exportSymbol goog.require goog.nullFunction
+
 @exportProperty ol.MapBrowserEvent.prototype.getCoordinate
 
 @exportSymbol ol.Collection