diff --git a/shadowsocks/tcprelay.py b/shadowsocks/tcprelay.py
index 5100f1c..1387ac7 100644
--- a/shadowsocks/tcprelay.py
+++ b/shadowsocks/tcprelay.py
@@ -502,7 +502,7 @@ class TCPRelayHandler(object):
         socks_version = common.ord(data[0])
         nmethods = common.ord(data[1])
         if socks_version != 5:
-            logging.warning('unsupported SOCKS protocol version ' + 
+            logging.warning('unsupported SOCKS protocol version ' +
                             str(socks_version))
             raise BadSocksHeader
         if nmethods < 1 or len(data) != nmethods + 2: