diff --git a/hecl/extern/boo b/hecl/extern/boo
index 18faf5575..18bb6e743 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 18faf55750094d91676eef59a2a4ca71ee3e25cc
+Subproject commit 18bb6e743997f38973dc5400514b615beff8af59