diff --git a/src/ol/extent.exports b/src/ol/extent.exports
index c18fc7ca7a..387a75529f 100644
--- a/src/ol/extent.exports
+++ b/src/ol/extent.exports
@@ -1,4 +1,5 @@
 @exportSymbol ol.extent.boundingExtent
+@exportSymbol ol.extent.buffer
 @exportSymbol ol.extent.containsCoordinate
 @exportSymbol ol.extent.containsExtent
 @exportSymbol ol.extent.createEmpty