diff --git a/waku/node/peer_manager/waku_peer_store.nim b/waku/node/peer_manager/waku_peer_store.nim
index f72091d8f..6269b4925 100644
--- a/waku/node/peer_manager/waku_peer_store.nim
+++ b/waku/node/peer_manager/waku_peer_store.nim
@@ -43,9 +43,6 @@ type
   # Keeps track of peer shards
   ShardBook* = ref object of PeerBook[seq[uint16]]
 
-  # Keeps track of Mix protocol public keys of peers
-  MixPubKeyBook* = ref object of PeerBook[Curve25519Key]
-
 proc getPeer*(peerStore: PeerStore, peerId: PeerId): RemotePeerInfo =
   let addresses =
     if peerStore[LastSeenBook][peerId].isSome():