diff --git a/hecl/extern/boo b/hecl/extern/boo
index bffdf43f9..a99bddc90 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit bffdf43f9e0870a6ff3494568281eb05ac4eba0b
+Subproject commit a99bddc90524b9ca532b0cf8865b493b3002fd67