diff --git a/peer_cache.go b/peer_cache.go
index a6c29f4e..fc0c2b2a 100644
--- a/peer_cache.go
+++ b/peer_cache.go
@@ -5,17 +5,17 @@ import (
 	"encoding/gob"
 	"fmt"
 	"io"
-	"log"
 	"sync"
 )
 
 type PeerCache struct {
 	sync.RWMutex
 	table map[PeerName]*Peer
+	onGC func(*Peer)
 }
 
-func NewPeerCache() *PeerCache {
-	return &PeerCache{table: make(map[PeerName]*Peer)}
+func NewPeerCache(onGC func(*Peer)) *PeerCache {
+	return &PeerCache{table: make(map[PeerName]*Peer), onGC: onGC}
 }
 
 func (cache *PeerCache) FetchWithDefault(peer *Peer) *Peer {
@@ -129,7 +129,7 @@ func (cache *PeerCache) garbageCollect(ourself *Peer) []*Peer {
 	for name, peer := range cache.table {
 		found, _ := ourself.HasPathTo(peer, false)
 		if !found && !peer.IsLocallyReferenced() {
-			log.Println("Removing unreachable", peer)
+			cache.onGC(peer)
 			delete(cache.table, name)
 			ourself.Router.Macs.Delete(peer)
 			removed = append(removed, peer)
diff --git a/router.go b/router.go
index 649777fc..ac8ae5fb 100644
--- a/router.go
+++ b/router.go
@@ -18,10 +18,13 @@ func NewRouter(iface *net.Interface, name PeerName, password []byte, connLimit i
 	onMacExpiry := func(mac net.HardwareAddr, peer *Peer) {
 		log.Println("Expired MAC", mac, "at", peer.Name)
 	}
+	onPeerGC := func(peer *Peer) {
+		log.Println("Removing unreachable", peer)
+	}
 	router := &Router{
 		Iface:     iface,
 		Macs:      NewMacCache(macMaxAge, onMacExpiry),
-		Peers:     NewPeerCache(),
+		Peers:     NewPeerCache(onPeerGC),
 		ConnLimit: connLimit,
 		BufSz:     bufSz,
 		LogFrame:  logFrame}