diff --git a/hecl/extern/boo b/hecl/extern/boo
index 0dfab1fda..85f9a633f 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 0dfab1fdad191a32347c0fa92ae6134475f0ab0e
+Subproject commit 85f9a633f0f3c0a00091160f1b94f7d1529a0fb8