diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 981129e..52c8e58 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -33,7 +33,7 @@ jobs:
     - name: Test with pytest
       run: |
         pip install .
-        coverage run --branch -m pytest tests
+        coverage run --branch --source=overlappogram/ -m pytest tests
     - name: Upload coverage reports to Codecov
       uses: codecov/codecov-action@v4.0.1
       with: