diff --git a/.github/workflows/pythontest.yml b/.github/workflows/pythontest.yml
index 88779a304..84e1424f5 100644
--- a/.github/workflows/pythontest.yml
+++ b/.github/workflows/pythontest.yml
@@ -36,4 +36,4 @@ jobs:
         flake8 ${{ matrix.python-code-path }} --show-source --max-complexity=12  --doctests --max-line-length=200 --statistics
     - name: Test with pytest
       run: |
-        pytest ${{ matrix.python-code-path }} --cov=${{ matrix.python-code-path }} --doctest-modules --cov-report=term --cov-fail-under=100 --cov-config=pytest.ini
+        PYTHONPATH=${{ matrix.python-code-path }} pytest ${{ matrix.python-code-path }} --cov=${{ matrix.python-code-path }} --doctest-modules --cov-report=term --cov-fail-under=100 --cov-config=pytest.ini