diff --git a/phpseclib/Net/SSH2.php b/phpseclib/Net/SSH2.php
index ce135152..ae53fbed 100644
--- a/phpseclib/Net/SSH2.php
+++ b/phpseclib/Net/SSH2.php
@@ -4598,10 +4598,7 @@ class Net_SSH2
                 switch ($algo) {
                     case 'arcfour128':
                     case 'arcfour256':
-                        if ($engine == CRYPT_ENGINE_INTERNAL) {
-                            $algos = array_diff($algos, array($algo));
-                            $ciphers[] = $algo;
-                        } else {
+                        if ($engine != CRYPT_ENGINE_INTERNAL) {
                             continue 2;
                         }
                 }