diff --git a/src/testdir/test_channel.py b/src/testdir/test_channel.py
index 35c34fc..e02f7db 100644
--- a/src/testdir/test_channel.py
+++ b/src/testdir/test_channel.py
@@ -285,4 +285,4 @@
         server.shutdown()
 
 if __name__ == "__main__":
-    main("localhost", 0)
+    main("127.0.0.1", 0)