Sync from interface.

diff --git a/interface b/interface
index 16a3e55c22873a21a84ed484ac7bf56e96c54694..6d4d9aa8af7fb462f93093f20d110e967506c24a 160000 (submodule)
--- a/interface
+++ b/interface
@@ -1 +1 @@
-Subproject commit 16a3e55c22873a21a84ed484ac7bf56e96c54694
+Subproject commit 6d4d9aa8af7fb462f93093f20d110e967506c24a