diff --git a/aiocache/backends/redis.py b/aiocache/backends/redis.py
index b150fbdd..22f175ed 100644
--- a/aiocache/backends/redis.py
+++ b/aiocache/backends/redis.py
@@ -11,9 +11,6 @@
     from aiocache.serializers import BaseSerializer
 
 
-_NOT_SET = object()
-
-
 class RedisBackend(BaseCache[str]):
     RELEASE_SCRIPT = (
         "if redis.call('get',KEYS[1]) == ARGV[1] then"