diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index e9c1ea87..8a22aae0 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -414,7 +414,7 @@ class SFTP extends SSH2
      */
     public function login($username, ...$args)
     {
-        $this->auth[] = $args;
+        $this->auth[] = array_merge([$username], $args);
         if (!$this->sublogin($username, ...$args)) {
             return false;
         }
diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index d3b266a8..fc3b1c9e 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -971,7 +971,7 @@ class SSH2
      * @var string|false
      * @access private
      */
-    var $preferred_signature_format = false;
+    protected $preferred_signature_format = false;
 
     /**
      * Authentication Credentials
@@ -979,7 +979,7 @@ class SSH2
      * @var array
      * @access private
      */
-    var $auth = [];
+    protected $auth = [];
 
     /**
      * Default Constructor.