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-rw-r--r--synapse/storage/events.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index 1578403f79..f631fb1733 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -228,7 +228,8 @@ class EventsStore(
         self._state_resolution_handler = hs.get_state_resolution_handler()
 
         # Collect metrics on the number of forward extremities that exist.
-        self._current_forward_extremities_amount = {}
+        # Counter of number of extremities to count
+        self._current_forward_extremities_amount = c_counter()
 
         BucketCollector(
             "synapse_forward_extremities",