diff --git a/hecl/extern/boo b/hecl/extern/boo
index c6d501561..9af8ec3d2 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit c6d501561202a85423a2618309ea3462ebec98c0
+Subproject commit 9af8ec3d23d9cb412b6fb44b4a6ab9041c41f4ff