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-rw-r--r--synapse/replication/tcp/streams/_base.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/synapse/replication/tcp/streams/_base.py b/synapse/replication/tcp/streams/_base.py
index 682d47f402..1f609f158c 100644
--- a/synapse/replication/tcp/streams/_base.py
+++ b/synapse/replication/tcp/streams/_base.py
@@ -383,7 +383,7 @@ class CachesStream(Stream):
     the cache on the workers
     """
 
-    @attr.s
+    @attr.s(slots=True)
     class CachesStreamRow:
         """Stream to inform workers they should invalidate their cache.
 
@@ -441,7 +441,7 @@ class DeviceListsStream(Stream):
     told about a device update.
     """
 
-    @attr.s
+    @attr.s(slots=True)
     class DeviceListsStreamRow:
         entity = attr.ib(type=str)