diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index 536a45cb..ce44ad7a 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -3452,7 +3452,7 @@ class SFTP extends SSH2
      */
     public function getSupportedVersions()
     {
-        if (!($this->bitmap & NET_SSH2_MASK_LOGIN)) {
+        if (!($this->bitmap & SSH2::MASK_LOGIN)) {
             return false;
         }