diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 65325c61..91d18141 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -39,4 +39,6 @@ jobs:
         if: matrix.ocaml-compiler == '5.0'
       - run: opam exec -- dune build @install @runtest
         if: matrix.ocaml-compiler == '5.0'
+      - run: opam install trace thread-local-storage
+      - run: opam exec -- dune build @install