diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 962cd45..ff3559e 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -32,5 +32,7 @@ jobs:
           pip install .
 
       - name: Run tests
+        env:
+          PYTHONPATH: src
         run: |
           pytest -v tests/test_codemapper.py