diff --git a/hecl/extern/boo b/hecl/extern/boo
index affb4e98d..6504bfc8c 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit affb4e98d36fe4b2447ba573507eb49f22b842b0
+Subproject commit 6504bfc8c87403801f38947b06ed2a30f10978fb