diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # Magic Wormhole
 [![PyPI](http://img.shields.io/pypi/v/magic-wormhole.svg)](https://pypi.python.org/pypi/magic-wormhole)
 ![Tests](https://github.com/magic-wormhole/magic-wormhole/workflows/Tests/badge.svg)
-[![Windows Build Status](https://ci.appveyor.com/api/projects/status/mfnn5rsyfnrq576a/branch/master?svg=true)](https://ci.appveyor.com/project/warner/magic-wormhole)
+[![Windows Build Status](https://ci.appveyor.com/api/projects/status/w1bdniovwm4egfyg/branch/master?svg=true)](https://ci.appveyor.com/project/warner/magic-wormhole)
 [![codecov.io](https://codecov.io/github/magic-wormhole/magic-wormhole/coverage.svg?branch=master)](https://codecov.io/github/magic-wormhole/magic-wormhole?branch=master)
 [![Docs](https://readthedocs.org/projects/magic-wormhole/badge/?version=latest)](https://magic-wormhole.readthedocs.io)