diff --git a/synapse/federation/sender/per_destination_queue.py b/synapse/federation/sender/per_destination_queue.py
index 1c681caa27..65ae1a56df 100644
--- a/synapse/federation/sender/per_destination_queue.py
+++ b/synapse/federation/sender/per_destination_queue.py
@@ -105,7 +105,7 @@ class PerDestinationQueue:
         self._instance_name = hs.get_instance_name()
         self._federation_shard_config = hs.config.worker.federation_shard_config
         self._state = hs.get_state_handler()
-        self.msc4354_enabled = hs.config.experimental.msc4354_enabled
+        self._msc4354_enabled = hs.config.experimental.msc4354_enabled
 
         self._should_send_on_this_instance = True
         if not self._federation_shard_config.should_handle(
@@ -584,7 +584,7 @@ class PerDestinationQueue:
                     # send.
                     extrem_events = await self._store.get_events_as_list(extrems)
 
-                    if self.msc4354_enabled:
+                    if self._msc4354_enabled:
                         # we also want to send sticky events that are still active in this room
                         sticky_event_ids = (
                             await self._store.get_sticky_event_ids_sent_by_self(
diff --git a/synapse/rest/client/room.py b/synapse/rest/client/room.py
index a8fe574f32..d09425a186 100644
--- a/synapse/rest/client/room.py
+++ b/synapse/rest/client/room.py
@@ -210,7 +210,7 @@ class RoomStateEventRestServlet(RestServlet):
         self.clock = hs.get_clock()
         self._max_event_delay_ms = hs.config.server.max_event_delay_ms
         self._spam_checker_module_callbacks = hs.get_module_api_callbacks().spam_checker
-        self.msc4354_enabled = hs.config.experimental.msc4354_enabled
+        self._msc4354_enabled = hs.config.experimental.msc4354_enabled
 
     def register(self, http_server: HttpServer) -> None:
         # /rooms/$roomid/state/$eventtype
@@ -333,7 +333,7 @@ class RoomStateEventRestServlet(RestServlet):
             origin_server_ts = parse_integer(request, "ts")
 
         sticky_duration_ms: int | None = None
-        if self.msc4354_enabled:
+        if self._msc4354_enabled:
             sticky_duration_ms = parse_integer(request, StickyEvent.QUERY_PARAM_NAME)
 
         delay = _parse_request_delay(request, self._max_event_delay_ms)
@@ -410,7 +410,7 @@ class RoomSendEventRestServlet(TransactionRestServlet):
         self.delayed_events_handler = hs.get_delayed_events_handler()
         self.auth = hs.get_auth()
         self._max_event_delay_ms = hs.config.server.max_event_delay_ms
-        self.msc4354_enabled = hs.config.experimental.msc4354_enabled
+        self._msc4354_enabled = hs.config.experimental.msc4354_enabled
 
     def register(self, http_server: HttpServer) -> None:
         # /rooms/$roomid/send/$event_type[/$txn_id]
@@ -432,7 +432,7 @@ class RoomSendEventRestServlet(TransactionRestServlet):
             origin_server_ts = parse_integer(request, "ts")
 
         sticky_duration_ms: int | None = None
-        if self.msc4354_enabled:
+        if self._msc4354_enabled:
             sticky_duration_ms = parse_integer(request, StickyEvent.QUERY_PARAM_NAME)
 
         delay = _parse_request_delay(request, self._max_event_delay_ms)
diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py
index 38ac4e68c5..b4de2e9bb3 100644
--- a/synapse/storage/databases/main/events.py
+++ b/synapse/storage/databases/main/events.py
@@ -264,7 +264,7 @@ class PersistEventsStore:
         self.database_engine = db.engine
         self._clock = hs.get_clock()
         self._instance_name = hs.get_instance_name()
-        self.msc4354_sticky_events = hs.config.experimental.msc4354_enabled
+        self._msc4354_enabled = hs.config.experimental.msc4354_enabled
 
         self._ephemeral_messages_enabled = hs.config.server.enable_ephemeral_messages
         self.is_mine_id = hs.is_mine_id
@@ -391,7 +391,7 @@ class PersistEventsStore:
             # get_events_as_list and get_partial_filtered_current_state_ids to handle soft-failure
             # re-evaluation, so it can't do that without leaking out the txn currently, hence it
             # now just lives outside.
-            if self.msc4354_sticky_events:
+            if self._msc4354_enabled:
                 # re-evaluate soft-failed sticky events.
                 await self.store.reevaluate_soft_failed_sticky_events(
                     room_id,
@@ -1201,7 +1201,7 @@ class PersistEventsStore:
                 sliding_sync_table_changes,
             )
 
-        if self.msc4354_sticky_events:
+        if self._msc4354_enabled:
             self.store.insert_sticky_events_txn(
                 txn, [ev for ev, _ in events_and_contexts]
             )
@@ -2667,7 +2667,7 @@ class PersistEventsStore:
                 # event isn't an outlier any more.
                 self._update_backward_extremeties(txn, [event])
 
-                if self.msc4354_sticky_events and event.sticky_duration():
+                if self._msc4354_enabled and event.sticky_duration():
                     # The de-outliered event is sticky. Update the sticky events table to ensure
                     # we delivery this down /sync.
                     self.store.insert_sticky_events_txn(txn, [event])