diff --git a/lib/src/timeline.dart b/lib/src/timeline.dart
index f465e718..c592620f 100644
--- a/lib/src/timeline.dart
+++ b/lib/src/timeline.dart
@@ -363,7 +363,7 @@ class Timeline {
   }
 
   /// Set the read marker to the last synced event in this timeline.
-  Future<void> setReadMarker(String? eventId, {bool? public}) async {
+  Future<void> setReadMarker({String? eventId, bool? public}) async {
     eventId ??=
         events.firstWhereOrNull((event) => event.status.isSynced)?.eventId;
     if (eventId == null) return;
diff --git a/test/timeline_context_test.dart b/test/timeline_context_test.dart
index cb4d574b..f62b45c8 100644
--- a/test/timeline_context_test.dart
+++ b/test/timeline_context_test.dart
@@ -480,7 +480,7 @@ void main() {
       await waitForCount(7);
 
       room.notificationCount = 1;
-      await timeline.setReadMarker(null);
+      await timeline.setReadMarker();
       //expect(room.notificationCount, 0);
     });
     test('sending an event and the http request finishes first, 0 -> 1 -> 2',
diff --git a/test/timeline_test.dart b/test/timeline_test.dart
index 543d77e6..97f73897 100644
--- a/test/timeline_test.dart
+++ b/test/timeline_test.dart
@@ -706,7 +706,7 @@ void main() {
       ));
       await Future.delayed(Duration(milliseconds: 50));
       room.notificationCount = 1;
-      await timeline.setReadMarker(null);
+      await timeline.setReadMarker();
       //expect(room.notificationCount, 0);
     });
     test('sending an event and the http request finishes first, 0 -> 1 -> 2',