diff --git a/lib/src/room.dart b/lib/src/room.dart
index 49716e01..87f71ac8 100644
--- a/lib/src/room.dart
+++ b/lib/src/room.dart
@@ -471,6 +471,7 @@ class Room {
     if (o is Map<String, dynamic>) {
       return Tag(
         order: o.tryGet<num>('order', TryGet.silent)?.toDouble(),
+        additionalProperties: Map.from(o)..remove('order'),
       );
     }
     return Tag();