diff --git a/phpseclib/Net/SCP.php b/phpseclib/Net/SCP.php
index 64756c49..8587de77 100644
--- a/phpseclib/Net/SCP.php
+++ b/phpseclib/Net/SCP.php
@@ -201,7 +201,7 @@ class Net_SCP {
                 return false;
             }
             $size = filesize($data);
-            for ($i = 0; $i < $length; $i++) {
+            for ($i = 0; $i < $size; $i += $this->packet_size) {
                 $this->_send(fgets($fp, $this->packet_size));
             }
             fclose($fp);	
@@ -338,4 +338,4 @@ class Net_SCP {
                 $this->ssh->disconnect();
          }
     }
-}
\ No newline at end of file
+}