diff --git a/examples/pubsub/chat/ui.go b/examples/pubsub/chat/ui.go
index 165f67685e..51725bd1bb 100644
--- a/examples/pubsub/chat/ui.go
+++ b/examples/pubsub/chat/ui.go
@@ -121,10 +121,8 @@ func (ui *ChatUI) end() {
 func (ui *ChatUI) refreshPeers() {
 	peers := ui.cr.ListPeers()
 
-	// clear is not threadsafe so we need to take the lock.
-	ui.peersList.Lock()
+	// clear is thread-safe
 	ui.peersList.Clear()
-	ui.peersList.Unlock()
 
 	for _, p := range peers {
 		fmt.Fprintln(ui.peersList, shortID(p))