diff --git a/appveyor.yml b/appveyor.yml
index d1ac7c0ed..c61241c67 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -51,6 +51,8 @@ build_script:
     - "pip freeze"
 
     # Build
+    # --no-isolation complains about oldest-supported-numpy not being installed
+    - "python -c \"text=open('pyproject.toml').read().replace('oldest-supported-','');open('pyproject.toml','w').write(text)\""
     - "python -m build --no-isolation --wheel"
     - ps: "ls dist"