diff --git a/phpseclib/Net/SFTP.php b/phpseclib/Net/SFTP.php
index 10d98fba..7a4dd7bf 100644
--- a/phpseclib/Net/SFTP.php
+++ b/phpseclib/Net/SFTP.php
@@ -2385,7 +2385,11 @@ class SFTP extends SSH2
             if ($local_start >= 0) {
                 fseek($fp, $local_start);
                 $size-= $local_start;
+            } elseif ($mode & NET_SFTP_RESUME) {
+                fseek($fp, $offset);
+                $size-= $offset;
             }
+
         } elseif ($dataCallback) {
             $size = 0;
         } else {