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-rw-r--r--synapse/storage/relations.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/storage/relations.py b/synapse/storage/relations.py
index 6e216066ab..42f587a7d8 100644
--- a/synapse/storage/relations.py
+++ b/synapse/storage/relations.py
@@ -280,7 +280,7 @@ class RelationsWorkerStore(SQLBaseStore):
             having_clause = ""
 
         sql = """
-            SELECT type, aggregation_key, COUNT(*), MAX(stream_ordering)
+            SELECT type, aggregation_key, COUNT(DISTINCT sender), MAX(stream_ordering)
             FROM event_relations
             INNER JOIN events USING (event_id)
             WHERE {where_clause}