diff --git a/synapse/storage/stream.py b/synapse/storage/stream.py
index 9925f04bf..57c2e4dfe 100644
--- a/synapse/storage/stream.py
+++ b/synapse/storage/stream.py
@@ -35,7 +35,7 @@ what sort order was used:
 
 from twisted.internet import defer
 
-from ._base import SQLBaseStore, cached
+from ._base import SQLBaseStore
 from synapse.api.constants import EventTypes
 from synapse.api.errors import SynapseError
 from synapse.util.logutils import log_function