diff --git a/appveyor.yml b/appveyor.yml
index 4ed269dbe..46c3fa6d0 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -43,6 +43,8 @@ build_script:
     - "pip install --upgrade build"
     - "pip install --upgrade setuptools"
     - "pip install --upgrade wheel"
+    # --no-isolation complains about oldest-supported-numpy not being installed
+    - "pip install oldest-supported-numpy"
     - "pip install --upgrade numpy"
     - "pip install --upgrade cython"
 
@@ -51,8 +53,6 @@ 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"