diff --git a/server-packet.go b/server-packet.go
index f9ef180..a2d8937 100644
--- a/server-packet.go
+++ b/server-packet.go
@@ -95,8 +95,9 @@ func (s *PacketServer) Serve(conn net.PacketConn) error {
 	s.mu.Unlock()
 
 	type requestKey struct {
-		IP         string
-		Identifier byte
+		IP            string
+		Identifier    byte
+		Authenticator [16]byte
 	}
 
 	var (
@@ -151,8 +152,9 @@ func (s *PacketServer) Serve(conn net.PacketConn) error {
 			}
 
 			key := requestKey{
-				IP:         remoteAddr.String(),
-				Identifier: packet.Identifier,
+				IP:            remoteAddr.String(),
+				Identifier:    packet.Identifier,
+				Authenticator: packet.Authenticator,
 			}
 			requestsLock.Lock()
 			if _, ok := requests[key]; ok {