diff --git a/synapse/storage/receipts.py b/synapse/storage/receipts.py
index ccc3811e8..9747a04a9 100644
--- a/synapse/storage/receipts.py
+++ b/synapse/storage/receipts.py
@@ -145,7 +145,7 @@ class ReceiptsStore(SQLBaseStore):
 
         defer.returnValue([ev for res in results.values() for ev in res])
 
-    @cachedInlineCallbacks(num_args=3, max_entries=5000, tree=True)
+    @cachedInlineCallbacks(num_args=3, tree=True)
     def get_linearized_receipts_for_room(self, room_id, to_key, from_key=None):
         """Get receipts for a single room for sending to clients.