diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index 3858d08..137e20a 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -37,7 +37,7 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Test with pytest and coverage
       run: |
-        coverage run -m pytest
+        coverage run --source=propka -m pytest
         coverage report -m | tee coverage.txt
         coverage html
     - name: Upload coverage to https://codecov.io/gh/jensengroup/propka