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-rw-r--r--synapse/handlers/e2e_keys.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/e2e_keys.py b/synapse/handlers/e2e_keys.py
index d629c7c16c..dd40fd1299 100644
--- a/synapse/handlers/e2e_keys.py
+++ b/synapse/handlers/e2e_keys.py
@@ -1201,7 +1201,7 @@ def _one_time_keys_match(old_key_json, new_key):
     return old_key == new_key_copy
 
 
-@attr.s
+@attr.s(slots=True)
 class SignatureListItem:
     """An item in the signature list as used by upload_signatures_for_device_keys.
     """