diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index 71cae001..9bf8921e 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -3310,7 +3310,7 @@ class SSH2
                 $this->bitmap^= self::MASK_WINDOW_ADJUST;
                 // using an invalid channel will let the buffers be built up for the valid channels
                 $this->_get_channel_packet(-1);
-                $this->bitmap^= NET_SSH2_MASK_WINDOW_ADJUST;
+                $this->bitmap^= self::MASK_WINDOW_ADJUST;
             }
 
             /* The maximum amount of data allowed is determined by the maximum