diff --git a/phpseclib/Crypt/Common/SymmetricKey.php b/phpseclib/Crypt/Common/SymmetricKey.php
index 192400b3..61cc18c9 100644
--- a/phpseclib/Crypt/Common/SymmetricKey.php
+++ b/phpseclib/Crypt/Common/SymmetricKey.php
@@ -1325,7 +1325,7 @@ abstract class SymmetricKey
                     $plaintext = '';
                     if ($this->continuousBuffer) {
                         $iv = &$this->decryptIV;
-                        $pos = &$this->buffer['pos'];
+                        $pos = &$this->debuffer['pos'];
                     } else {
                         $iv = $this->decryptIV;
                         $pos = 0;