1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/storage/databases/main/cache.py b/synapse/storage/databases/main/cache.py
index 63624f3e8f..246d2acc2f 100644
--- a/synapse/storage/databases/main/cache.py
+++ b/synapse/storage/databases/main/cache.py
@@ -313,6 +313,8 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
             "get_unread_event_push_actions_by_room_for_user", (room_id,)
         )
 
+        self._attempt_to_invalidate_cache("_get_max_event_pos", (room_id,))
+
         # The `_get_membership_from_event_id` is immutable, except for the
         # case where we look up an event *before* persisting it.
         self._attempt_to_invalidate_cache("_get_membership_from_event_id", (event_id,))
@@ -404,6 +406,8 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
         )
         self._attempt_to_invalidate_cache("get_relations_for_event", (room_id,))
 
+        self._attempt_to_invalidate_cache("_get_max_event_pos", (room_id,))
+
         self._attempt_to_invalidate_cache("_get_membership_from_event_id", None)
         self._attempt_to_invalidate_cache("get_applicable_edit", None)
         self._attempt_to_invalidate_cache("get_thread_id", None)
@@ -476,6 +480,8 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
         self._attempt_to_invalidate_cache("get_room_type", (room_id,))
         self._attempt_to_invalidate_cache("get_room_encryption", (room_id,))
 
+        self._attempt_to_invalidate_cache("_get_max_event_pos", (room_id,))
+
         # And delete state caches.
 
         self._invalidate_state_caches_all(room_id)