diff --git a/synapse/storage/client_ips.py b/synapse/storage/client_ips.py
index 1d89b50f5..067820a5d 100644
--- a/synapse/storage/client_ips.py
+++ b/synapse/storage/client_ips.py
@@ -35,15 +35,8 @@ LAST_SEEN_GRANULARITY = 120 * 1000
 
 class ClientIpBackgroundUpdateStore(background_updates.BackgroundUpdateStore):
     def __init__(self, db_conn, hs):
-
-        self.client_ip_last_seen = Cache(
-            name="client_ip_last_seen", keylen=4, max_entries=50000 * CACHE_SIZE_FACTOR
-        )
-
         super(ClientIpBackgroundUpdateStore, self).__init__(db_conn, hs)
 
-        self.user_ips_max_age = hs.config.user_ips_max_age
-
         self.register_background_index_update(
             "user_ips_device_index",
             index_name="user_ips_device_id",