diff --git a/Lib/http/server.py b/Lib/http/server.py
index 7d0da5052d2d4d..281da28a0ad04e 100644
--- a/Lib/http/server.py
+++ b/Lib/http/server.py
@@ -1104,7 +1104,7 @@ def run_cgi(self):
                     "CGI script is not executable (%r)" % scriptname)
                 return
 
-        # Reference: http://hoohoo.ncsa.uiuc.edu/cgi/env.html
+        # Reference: https://www6.uniovi.es/~antonio/ncsa_httpd/cgi/env.html
         # XXX Much of the following could be prepared ahead of time!
         env = copy.deepcopy(os.environ)
         env['SERVER_SOFTWARE'] = self.version_string()