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-rw-r--r--synapse/handlers/search.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/synapse/handlers/search.py b/synapse/handlers/search.py
index e1fb2db0c9..b7545c111f 100644
--- a/synapse/handlers/search.py
+++ b/synapse/handlers/search.py
@@ -121,7 +121,7 @@ class SearchHandler(BaseHandler):
         room_ids = search_filter.filter_rooms(room_ids)
 
         if batch_group == "room_id":
-            room_ids = room_ids & {batch_group_key}
+            room_ids.intersection_update({batch_group_key})
 
         rank_map = {}  # event_id -> rank of event
         allowed_events = []