diff --git a/lib/server.js b/lib/server.js
index 092e0d8..e13e0dc 100644
--- a/lib/server.js
+++ b/lib/server.js
@@ -101,6 +101,8 @@ app._configureWS = function(socket, key, id, token) {
           dst: message.dst,
           payload: message.payload
         });
+      } else if (message.type === 'HEARTBEAT') {
+        // Ignore - nothing needs doing here.
       } else {
         util.prettyError("Message unrecognized");
       }