diff --git a/README.md b/README.md
index bbd6b1c..b73a7fd 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 To set up a ZeroTest instance, simply set up a Web server to host `index.html` over an unencrypted HTTP connection. (ZeroTest will not work if loaded over HTTPS, because [restrictions on mixed content](https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content) will block its requests.)
 
-A public instance is available at [https://zerotest.kj7rrv.com/](https://zerotest.kj7rrv.com/); it uses the following Nginx configuration:
+A public instance is available at [http://zerotest.kj7rrv.com/](http://zerotest.kj7rrv.com/); it uses the following Nginx configuration:
 
 ```nginx
 server {