diff --git a/box-tree-api/Overview.bs b/box-tree-api/Overview.bs
index 64a2419a..4097e3bd 100644
--- a/box-tree-api/Overview.bs
+++ b/box-tree-api/Overview.bs
@@ -79,7 +79,7 @@ interface DeadFragmentInformation {
 	readonly attribute double top;
 	readonly attribute double left;
 	readonly attribute boolean isOverflowed;
-	readonly attribute sequence<DeadFragmentInformation>? children;
+	readonly attribute FrozenArray<DeadFragmentInformation>? children;
 	readonly attribute DeadFragmentInformation? nextSibling;
 	readonly attribute DeadFragmentInformation? previousSibling;
 	readonly attribute DeadFragmentInformation? nextInBox;