diff --git a/damus/Nostr/NostrEvent.swift b/damus/Nostr/NostrEvent.swift
index 3a106c06..45798274 100644
--- a/damus/Nostr/NostrEvent.swift
+++ b/damus/Nostr/NostrEvent.swift
@@ -724,7 +724,7 @@ func gather_reply_ids(our_pubkey: String, from: NostrEvent) -> [ReferencedId] {
     var ids = get_referenced_ids(tags: from.tags, key: "e").first.map { [$0] } ?? []
 
     ids.append(ReferencedId(ref_id: from.id, relay_id: nil, key: "e"))
-    ids.append(contentsOf: from.referenced_pubkeys.filter { $0.ref_id != our_pubkey })
+    ids.append(contentsOf: Set(from.referenced_pubkeys.filter { $0.ref_id != our_pubkey }))
     if from.pubkey != our_pubkey {
         ids.append(ReferencedId(ref_id: from.pubkey, relay_id: nil, key: "p"))
     }