diff --git a/src/api/client/sync/v5.rs b/src/api/client/sync/v5.rs
index 8bc9ff295..fd2f9ae95 100644
--- a/src/api/client/sync/v5.rs
+++ b/src/api/client/sync/v5.rs
@@ -320,6 +320,7 @@ async fn handle_lists<'a, Rooms, AllRooms>(
 
 		for mut range in ranges {
 			range.0 = uint!(0);
+			range.1 = range.1.checked_add(uint!(1)).unwrap_or(range.1);
 			range.1 = range
 				.1
 				.clamp(range.0, UInt::try_from(active_rooms.len()).unwrap_or(UInt::MAX));