diff --git a/gnocchi/common/redis.py b/gnocchi/common/redis.py
index be125075c..e8a05834d 100644
--- a/gnocchi/common/redis.py
+++ b/gnocchi/common/redis.py
@@ -119,7 +119,7 @@
 ]
 
 
-def _parse_sentinel(cls, sentinel):
+def _parse_sentinel(sentinel):
     # IPv6 (eg. [::1]:6379 )
     match = re.search(r'^\[(\S+)\]:(\d+)$', sentinel)
     if match: