diff --git a/.appveyor.yml b/.appveyor.yml
index 00ecccb..960c7d6 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -1,8 +1,8 @@
 environment:
+  # For Python versions available on Appveyor, see
+  # https://www.appveyor.com/docs/windows-images-software/#python
   matrix:
-    - PYTHON: "C:\\Python39-x64"
-
-platform: x64
+    - {APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019, PYTHON: "C:\\Python39-x64"}
 
 install:
   - "SET PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"