diff --git a/src/objectliterals.exports b/src/objectliterals.exports
index 65508a2711..2ea572d8f7 100644
--- a/src/objectliterals.exports
+++ b/src/objectliterals.exports
@@ -129,7 +129,7 @@
 @exportObjectLiteral ol.source.SourceOptions
 @exportObjectLiteralProperty ol.source.SourceOptions.attributions Array.<ol.Attribution>|undefined
 @exportObjectLiteralProperty ol.source.SourceOptions.extent ol.Extent|undefined
-@exportObjectLiteralProperty ol.source.SourceOptions.projection ol.Projection|undefined
+@exportObjectLiteralProperty ol.source.SourceOptions.projection ol.ProjectionLike
 
 @exportObjectLiteral ol.source.StamenOptions
 @exportObjectLiteralProperty ol.source.StamenOptions.layer string