diff --git a/phpseclib/Crypt/Base.php b/phpseclib/Crypt/Base.php
index c2091387..79667a20 100644
--- a/phpseclib/Crypt/Base.php
+++ b/phpseclib/Crypt/Base.php
@@ -1002,7 +1002,7 @@ class Crypt_Base
                 case CRYPT_MODE_CBC:
                     if (!defined('OPENSSL_RAW_DATA')) {
                         $padding = str_repeat(chr($this->block_size), $this->block_size) ^ substr($ciphertext, -$this->block_size);
-                        $plaintext.= openssl_encrypt($padding, $this->cipher_name_openssl_ecb, $this->key, true);
+                        $ciphertext.= openssl_encrypt($padding, $this->cipher_name_openssl_ecb, $this->key, true);
                     }
                     $plaintext = openssl_decrypt($ciphertext, $this->cipher_name_openssl, $this->key, $this->openssl_options, $this->decryptIV);
                     if ($this->continuousBuffer) {