diff --git a/test/io/test_io.py b/test/io/test_io.py
index 9209463d13..efc76d49ca 100644
--- a/test/io/test_io.py
+++ b/test/io/test_io.py
@@ -196,6 +196,11 @@ def sleep():
 
         t.join()
 
+def test_random_port_bound(defaultenv):
+    "PostgREST should bind to a random port when PGRST_SERVER_PORT is 0."
+
+    with run(env=defaultenv, port="0") as postgrest:
+        assert True # liveness check is done by run(), so we just need to check that it doesn't fail
 
 def test_app_settings_reload(tmp_path, defaultenv):
     "App settings should be reloaded from file when PostgREST is sent SIGUSR2."