diff --git a/syndicate/distributed/server.rkt b/syndicate/distributed/server.rkt
index 796efa5..08cf926 100644
--- a/syndicate/distributed/server.rkt
+++ b/syndicate/distributed/server.rkt
@@ -70,4 +70,5 @@
     [(Connect _) (send-error! id 'duplicate-connection-setup)]
     [(Peer _) (send-error! id 'duplicate-connection-setup)]
     [(Ping) (send! (message-server->poa id (Pong)))]
+    [(Pong) (void)]
     [_ (send-error! id 'invalid-message)]))