diff --git a/memcache.py b/memcache.py
index 05b6657..e2691fd 100644
--- a/memcache.py
+++ b/memcache.py
@@ -800,8 +800,6 @@ def _map_and_prefix_keys(self, key_iterable, key_prefix):
                 # server. Returns the mangled key.
                 server, key = self._get_server(
                     (serverhash, key_prefix + key))
-
-                orig_key = orig_key[1]
             else:
                 key = self._encode_key(orig_key)
                 if not isinstance(key, six.binary_type):