diff --git a/hecl/extern/boo b/hecl/extern/boo
index 59371f5fe..40e94f88e 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 59371f5fed5656624ea341b24c33389e8dbb19af
+Subproject commit 40e94f88e008ee8ed36b4f7bff2bd005c5b7bb4a