diff --git a/src/composables/useNostrChat.ts b/src/composables/useNostrChat.ts
index 6815da7..222e119 100644
--- a/src/composables/useNostrChat.ts
+++ b/src/composables/useNostrChat.ts
@@ -417,6 +417,9 @@ export function useNostrChat() {
         pubkey: currentUser.value.pubkey
       }
 
+      // Add to processed IDs to prevent duplicate processing
+      processedMessageIds.value.add(event.id)
+
       if (!messages.value.has(peerPubkey)) {
         messages.value.set(peerPubkey, [])
       }