diff --git a/src/webkit.cs b/src/webkit.cs
index cc2899b828fc..57b7ba90ce29 100644
--- a/src/webkit.cs
+++ b/src/webkit.cs
@@ -7866,7 +7866,7 @@ interface WKWebExtensionWindow {
 		void Close (WKWebExtensionContext context, WKWebExtensionWindowCallback completionHandler);
 	}
 
-	delegate void WKWebExtensionControllerDataRecordCallback (WKWebExtensionDataRecord dataRecord);
+	delegate void WKWebExtensionControllerDataRecordCallback ([NullAllowed] WKWebExtensionDataRecord dataRecord);
 	delegate void WKWebExtensionControllerDataRecordsCallback (WKWebExtensionDataRecord [] dataRecords);
 
 	[Mac (15, 4), iOS (18, 4), MacCatalyst (18, 4), NoTV]