diff --git a/ssh/kex_test.go b/ssh/kex_test.go
index 787144b..104009e 100644
--- a/ssh/kex_test.go
+++ b/ssh/kex_test.go
@@ -13,7 +13,7 @@ import (
 )
 
 func pipe() (net.Conn, net.Conn, error) {
-	l, err := net.Listen("tcp", ":0")
+	l, err := net.Listen("tcp", "127.0.0.1:0")
 	if err != nil {
 		return nil, nil, err
 	}