diff --git a/hecl/extern/boo b/hecl/extern/boo
index 04ff1692d..18cbfd286 160000
--- a/hecl/extern/boo
+++ b/hecl/extern/boo
@@ -1 +1 @@
-Subproject commit 04ff1692d8e46d8f5aca7796f44a0150fb423e40
+Subproject commit 18cbfd28655ad2144332b777889f8fa9c37641e2