diff --git a/build/fbcode_builder/manifests/boost b/build/fbcode_builder/manifests/boost
index f051cfd1b034..4b254e308ab2 100644
--- a/build/fbcode_builder/manifests/boost
+++ b/build/fbcode_builder/manifests/boost
@@ -81,3 +81,6 @@ builder = boost
 --with-timer
 --with-type_erasure
 --with-wave
+
+[b2.args.os=darwin]
+toolset=clang