diff --git a/shadowsocks/crypto/rc4_md5.py b/shadowsocks/crypto/rc4_md5.py
index b9cd72b..ee421b6 100644
--- a/shadowsocks/crypto/rc4_md5.py
+++ b/shadowsocks/crypto/rc4_md5.py
@@ -60,8 +60,8 @@ ciphers = {
 def test():
     from shadowsocks.crypto import util
 
-    cipher = create_cipher(b'salsa20-ctr', b'k' * 32, b'i' * 8, 1)
-    decipher = create_cipher(b'salsa20-ctr', b'k' * 32, b'i' * 8, 1)
+    cipher = create_cipher(b'rc4-md5', b'k' * 32, b'i' * 16, 1)
+    decipher = create_cipher(b'rc4-md5', b'k' * 32, b'i' * 16, 1)
 
     util.run_cipher(cipher, decipher)