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-rw-r--r--synapse/handlers/directory.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/handlers/directory.py b/synapse/handlers/directory.py
index 2ea52257cb..d31b0fbb17 100644
--- a/synapse/handlers/directory.py
+++ b/synapse/handlers/directory.py
@@ -485,7 +485,8 @@ class DirectoryHandler:
                 )
             )
             if canonical_alias:
-                room_aliases.append(canonical_alias)
+                # Ensure we do not mutate room_aliases.
+                room_aliases = room_aliases + [canonical_alias]
 
             if not self.config.roomdirectory.is_publishing_room_allowed(
                 user_id, room_id, room_aliases