Issue #21566: Make use of socket.listen() default backlog.
diff --git a/Lib/test/test_support.py b/Lib/test/test_support.py
index 9bd0a01..212c9f3 100644
--- a/Lib/test/test_support.py
+++ b/Lib/test/test_support.py
@@ -84,7 +84,7 @@
     def test_bind_port(self):
         s = socket.socket()
         support.bind_port(s)
-        s.listen(1)
+        s.listen()
         s.close()
 
     # Tests for temp_dir()