diff --git a/test/server.py b/test/server.py
index c3defd6..c1ca898 100644
--- a/test/server.py
+++ b/test/server.py
@@ -1,3 +1,4 @@
+import os
 import responder
 
 api = responder.API(enable_hsts=True)
@@ -8,4 +9,4 @@ def route(req, resp):
     resp.text = "hello, world!"
 
 
-api.run()
+api.run(port=int(os.environ["PORT"]))