diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 10d3c10..6dcc703 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -26,6 +26,6 @@ jobs:
         /sbin/start-stop-daemon --start --quiet --pidfile /tmp/custom_xvfb_99.pid --make-pidfile --background --exec /usr/bin/Xvfb -- :99 -screen 0 1920x1200x24 -ac +extension GLX
     - name: Run Unittests with pytest
       run: |
-        xvfb-run coverage run --source=beeref -m pytest -v -s
+        xvfb-run --server-num=99 --server-args="-screen 0 1920x1200x24" coverage run --source=beeref -m pytest -v -s
     - name: Upload Coverage report to Codecov
       uses: codecov/codecov-action@v1