diff --git a/.github/workflows/test-package.yml b/.github/workflows/test-package.yml
index 1c3721ab..cf170eb7 100644
--- a/.github/workflows/test-package.yml
+++ b/.github/workflows/test-package.yml
@@ -58,7 +58,7 @@ jobs:
         PYTHONWARNINGS: error
       run: |
         python -c "import tests"  # Compiles hissp.basic on package import.
-        pytest -v --cov=hissp --cov-report=xml --doctest-modules --doctest-glob *.md src/hissp/*.lissp tests/ docs/ $(python -c "import hissp; print(hissp.__path__[0])")
+        pytest -p no:cacheprovider -v --cov=hissp --cov-report=xml --doctest-modules --doctest-glob *.md src/hissp/*.lissp tests/ docs/ $(python -c "import hissp; print(hissp.__path__[0])")
     - name: Codecov
       uses: codecov/codecov-action@v1.0.4
       with: