diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 803fe60..87f4fd6 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -36,6 +36,6 @@ jobs:
 
       - run: opam install . --deps-only --with-test
 
-      - run: opam exec -- dune build
+      - run: opam exec -- dune build -p mlx,ocamlmerlin-mlx
 
       - run: opam exec -- dune runtest