diff --git a/.github/workflows/publish-to-pypi.yml b/.github/workflows/publish-to-pypi.yml
index fb75642..3747e30 100644
--- a/.github/workflows/publish-to-pypi.yml
+++ b/.github/workflows/publish-to-pypi.yml
@@ -29,6 +29,9 @@ jobs:
         build setuptools twine
         --user
 
+    - name: Prevent fallback onto setup.py
+      run: rm setup.py
+
     - name: Build a binary wheel and a source tarball
       run: python3 -m build
 
diff --git a/.github/workflows/publish-to-test-pypi.yml b/.github/workflows/publish-to-test-pypi.yml
index 8cc98fb..8b8d003 100644
--- a/.github/workflows/publish-to-test-pypi.yml
+++ b/.github/workflows/publish-to-test-pypi.yml
@@ -29,6 +29,9 @@ jobs:
         build setuptools twine
         --user
 
+    - name: Prevent fallback onto setup.py
+      run: rm setup.py
+
     - name: Build a binary wheel and a source tarball
       run: python3 -m build