diff --git a/build/fbcode_builder/manifests/glean b/build/fbcode_builder/manifests/glean
index f3ae4f8769825..5dc3a8724ee3d 100644
--- a/build/fbcode_builder/manifests/glean
+++ b/build/fbcode_builder/manifests/glean
@@ -28,6 +28,7 @@ builder = make
 [make.build_args]
 cabal-update
 all
+glass
 EXTRA_GHC_OPTS=-j4 +RTS -A32m -n4m -RTS
 CABAL_CONFIG_FLAGS=-f-clang-tests -f-hack-tests -f-typescript-tests -f-python-tests -f-dotnet-tests -f-go-tests -f-rust-tests -f-java-lsif-tests -f-flow-tests