diff --git a/phpseclib/Crypt/Common/SymmetricKey.php b/phpseclib/Crypt/Common/SymmetricKey.php
index 6f198cd3..888a7e9b 100644
--- a/phpseclib/Crypt/Common/SymmetricKey.php
+++ b/phpseclib/Crypt/Common/SymmetricKey.php
@@ -1584,7 +1584,7 @@ abstract class SymmetricKey
      *
      * May need to be overwritten by classes extending this one in some cases
      *
-     * @return int
+     * @return string
      * @access private
      */
     protected function openssl_translate_mode()