diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d8f2d4c7..820044ab 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -28,5 +28,8 @@ jobs:
     - run: opam depext -yt linol linol-lwt
     - run: opam install -t . --deps-only
     - run: opam exec -- dune build
+      if: ${{ matrix.ocaml-compiler == '5.1.x' }}
+    - run: opam exec -- dune build -p linol,linol-lwt
+      if: ${{ matrix.ocaml-compiler == '4.14.x' }}
     - run: opam exec -- dune runtest
-      if: ${{ matrix.os == 'ubuntu-latest'}}
+      if: ${{ matrix.os == 'ubuntu-latest' && matrix.ocaml-compiler == '5.1.x' }}