diff --git a/peer/peer.go b/peer/peer.go
index 1f508e7cb..20da1ff9a 100644
--- a/peer/peer.go
+++ b/peer/peer.go
@@ -16,6 +16,10 @@ type Peer struct {
 	Addresses []*ma.Multiaddr
 }
 
+func (p *Peer) Key() u.Key {
+	return u.Key(p.Id)
+}
+
 func (p *Peer) AddAddress(a *ma.Multiaddr) {
 	p.Addresses = append(p.Addresses, a)
 }