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-rw-r--r--synapse/handlers/acme_issuing_service.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/acme_issuing_service.py b/synapse/handlers/acme_issuing_service.py
index 69650ff221..7294649d71 100644
--- a/synapse/handlers/acme_issuing_service.py
+++ b/synapse/handlers/acme_issuing_service.py
@@ -76,7 +76,7 @@ def create_issuing_service(reactor, acme_url, account_key_file, well_known_resou
     )
 
 
-@attr.s
+@attr.s(slots=True)
 @implementer(ICertificateStore)
 class ErsatzStore:
     """