diff --git a/damus/Nostr/NostrEvent.swift b/damus/Nostr/NostrEvent.swift
index f9a66edf..b3704543 100644
--- a/damus/Nostr/NostrEvent.swift
+++ b/damus/Nostr/NostrEvent.swift
@@ -835,7 +835,7 @@ func first_eref_mention(ev: NostrEvent, privkey: String?) -> Mention? {
 extension [ReferencedId] {
     var pRefs: [ReferencedId] {
         get {
-            self.filter { ref in
+            Set(self).filter { ref in
                 ref.key == "p"
             }
         }