diff --git a/hecl/extern/boo b/hecl/extern/boo
index 65c99ad76..9adf481c8 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 65c99ad7697b2a6e1ad1a2212bc8de7b98d7e608
+Subproject commit 9adf481c8e5bd618d3bf50b669b29b70c6b2726d