diff --git a/.github/workflows/pypi.yml b/.github/workflows/pypi.yml
index 56d06bf..3b47162 100644
--- a/.github/workflows/pypi.yml
+++ b/.github/workflows/pypi.yml
@@ -46,6 +46,7 @@ jobs:
           pip install setuptools wheel
       - name: Build source distribution       
         run: |
+          python3 -c "import os; print("ISRELEASED" in os.environ)"
           python3 setup.py sdist
       - name: Store the distribution packages
         uses: actions/upload-artifact@v3