diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index e326c5d8..e0798b7d 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -251,7 +251,7 @@ class Net_SFTP extends Net_SSH2 {
      * @var Array
      * @access private
      */
-    var $max_sftp_packet = 1 << 20;
+    var $max_sftp_packet;
 
     /**
      * Default Constructor.
@@ -272,6 +272,9 @@ class Net_SFTP extends Net_SSH2 {
             case 'SSH-2.0-ROSSSH':
                 // PuTTY uses this as the size
                 $this->max_sftp_packet = 1 << 15;
+            break;
+            default:
+                $this->max_sftp_packet = 1 << 20;
         }
 
         $this->packet_types = array(