diff --git a/eth/downloader/peer.go b/eth/downloader/peer.go
index d74d23e74..6b8269495 100644
--- a/eth/downloader/peer.go
+++ b/eth/downloader/peer.go
@@ -237,6 +237,7 @@ func (ps *peerSet) Register(p *peerConnection) error {
 	}
 	p.rates = msgrate.NewTracker(ps.rates.MeanCapacities(), ps.rates.MedianRoundTrip())
 	if err := ps.rates.Track(p.id, p.rates); err != nil {
+		ps.lock.Unlock()
 		return err
 	}
 	ps.peers[p.id] = p
diff --git a/les/downloader/peer.go b/les/downloader/peer.go
index 5a92e9cf9..c2161e2da 100644
--- a/les/downloader/peer.go
+++ b/les/downloader/peer.go
@@ -350,6 +350,7 @@ func (ps *peerSet) Register(p *peerConnection) error {
 	}
 	p.rates = msgrate.NewTracker(ps.rates.MeanCapacities(), ps.rates.MedianRoundTrip())
 	if err := ps.rates.Track(p.id, p.rates); err != nil {
+		ps.lock.Unlock()
 		return err
 	}
 	ps.peers[p.id] = p