diff --git a/socks/manager.go b/socks/manager.go
index 3a3901a..3b4f3b9 100644
--- a/socks/manager.go
+++ b/socks/manager.go
@@ -31,6 +31,7 @@ type Manager struct {
 }
 
 func (m Manager) Serve() error {
+	var err error
 	if m.listen, err = net.Listen("tcp", m.host+":"+m.port); err != nil {
 		return nil, err
 	}