diff --git a/hecl/extern/boo b/hecl/extern/boo
index bb7728129..9724488da 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit bb7728129e538d4124d74e45cb4ef73f798fda3e
+Subproject commit 9724488da31f78b03b79d35957094bd766778d20