diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e924cbb..8c9fdf3 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -25,4 +25,7 @@ jobs:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
       - run: opam install . --deps-only --with-test
       - run: opam exec -- dune build
+      - run: |
+          chcp 65001
+          echo "OCAMLRUNPARAM=b" >> $env:GITHUB_ENV
       - run: opam exec -- dune runtest