diff --git a/.github/workflows/unittests.yml b/.github/workflows/unittests.yml
index 0fe2830fa..b433e6dc5 100644
--- a/.github/workflows/unittests.yml
+++ b/.github/workflows/unittests.yml
@@ -62,7 +62,7 @@ jobs:
       run: |
         pip install versioneer[toml]==0.29
         pip install . --no-deps --no-build-isolation
-        coverage run --omit structuretoolkit/_version.py -m unittest discover tests
+        coverage run  --omit="structuretoolkit/_version.py,tests/*" -m unittest discover tests
     - name: Coverage
       if:  matrix.label == 'linux-64-py-3-10'
       uses: coverallsapp/github-action@v2