diff --git a/lib/units/reaper/index.js b/lib/units/reaper/index.js
index 0c961b23..5a7c1d9b 100644
--- a/lib/units/reaper/index.js
+++ b/lib/units/reaper/index.js
@@ -92,6 +92,7 @@ module.exports = function(options) {
   function listenToChanges() {
     sub.on('message', wirerouter()
       .on(wire.DeviceIntroductionMessage, function(channel, message) {
+        ttlset.drop(message.serial, TtlSet.SILENT)
         ttlset.bump(message.serial, Date.now())
       })
       .on(wire.DeviceHeartbeatMessage, function(channel, message) {