diff --git a/shadowsocks/server.py b/shadowsocks/server.py
index f672de9..6ec63c0 100755
--- a/shadowsocks/server.py
+++ b/shadowsocks/server.py
@@ -74,7 +74,7 @@ def main():
         if type(password_obfs) == list:
             password = password_obfs[0]
             obfs = password_obfs[1]
-            if len(password_obfs) >= 2:
+            if len(password_obfs) > 2:
                 protocol = password_obfs[2]
         elif type(password_obfs) == dict:
             password = password_obfs.get('password', 'm')