diff --git a/hecl/extern/boo b/hecl/extern/boo
index 4a928dd2d..818a20d9f 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 4a928dd2d724f84143ca81d54a8c59b6accc4648
+Subproject commit 818a20d9f6121464be44e3068366d9584f5642fd