diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index 7165b57a..9baca991 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -2085,8 +2085,8 @@ class Net_SFTP extends Net_SSH2
         $sent = 0;
         $size = $size < 0 ? ($size & 0x7FFFFFFF) + 0x80000000 : $size;
 
-        $sftp_packet_size = 4096; // PuTTY uses 4096
-        // make the SFTP packet be exactly 4096 bytes by including the bytes in the NET_SFTP_WRITE packets "header"
+        $sftp_packet_size = $this->max_sftp_packet;
+        // make the SFTP packet be exactly the SFTP packet size by including the bytes in the NET_SFTP_WRITE packets "header"
         $sftp_packet_size-= strlen($handle) + 25;
         $i = $j = 0;
         while ($dataCallback || ($size === 0 || $sent < $size)) {