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-rw-r--r--synapse/storage/databases/main/events.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/databases/main/events.py b/synapse/storage/databases/main/events.py
index 1e731d56bd..990698aa5c 100644
--- a/synapse/storage/databases/main/events.py
+++ b/synapse/storage/databases/main/events.py
@@ -2454,7 +2454,7 @@ class _LinkMap:
             return target_seq <= src_seq
 
         # We have to graph traverse the links to check for indirect paths.
-        visited_chains = collections.Counter()
+        visited_chains: Dict[int, int] = collections.Counter()
         search = [(src_chain, src_seq)]
         while search:
             chain, seq = search.pop()