diff --git a/redis/cache.py b/redis/cache.py
index 9971edd256..cb29ffe785 100644
--- a/redis/cache.py
+++ b/redis/cache.py
@@ -50,6 +50,7 @@ def cache(self):
         pass
 
     @cache.setter
+    @abstractmethod
     def cache(self, value):
         pass