diff --git a/lib/rt64 b/lib/rt64
index 88c618c..646bb81 160000
--- a/lib/rt64
+++ b/lib/rt64
@@ -1 +1 @@
-Subproject commit 88c618c1f8d8089f94e78537e49e0d77798fc0be
+Subproject commit 646bb813a54dbef5bec8d38f5a08fd1acde1d555