diff --git a/examples/dashboard/main.go b/examples/dashboard/main.go
index 53b770d..47e6578 100644
--- a/examples/dashboard/main.go
+++ b/examples/dashboard/main.go
@@ -27,7 +27,7 @@ func main() {
 	server := mqtt.New()
 
 	stats := listeners.NewHTTPStats("stats", ":8080")
-	err = server.AddListener(stats, nil)
+	err := server.AddListener(stats, nil)
 	if err != nil {
 		log.Fatal(err)
 	}
diff --git a/examples/persistence/main.go b/examples/persistence/main.go
index 517c5f6..cd4b0f1 100644
--- a/examples/persistence/main.go
+++ b/examples/persistence/main.go
@@ -6,12 +6,14 @@ import (
 	"os"
 	"os/signal"
 	"syscall"
+	"time"
 
 	"github.com/logrusorgru/aurora"
 	"go.etcd.io/bbolt"
 
 	mqtt "github.com/mochi-co/mqtt/server"
 	"github.com/mochi-co/mqtt/server/listeners"
+	"github.com/mochi-co/mqtt/server/listeners/auth"
 	"github.com/mochi-co/mqtt/server/persistence/bolt"
 )
 
@@ -29,7 +31,7 @@ func main() {
 	server := mqtt.New()
 	tcp := listeners.NewTCP("t1", ":1883")
 	err := server.AddListener(tcp, &listeners.Config{
-		Auth: new(Auth),
+		Auth: new(auth.Allow),
 	})
 	if err != nil {
 		log.Fatal(err)
diff --git a/examples/tcp/main.go b/examples/tcp/main.go
index 6f9ec90..3737f6c 100644
--- a/examples/tcp/main.go
+++ b/examples/tcp/main.go
@@ -11,6 +11,7 @@ import (
 
 	mqtt "github.com/mochi-co/mqtt/server"
 	"github.com/mochi-co/mqtt/server/listeners"
+	"github.com/mochi-co/mqtt/server/listeners/auth"
 )
 
 func main() {
@@ -27,7 +28,7 @@ func main() {
 	server := mqtt.New()
 	tcp := listeners.NewTCP("t1", ":1883")
 	err := server.AddListener(tcp, &listeners.Config{
-		Auth: new(Auth),
+		Auth: new(auth.Allow),
 	})
 	if err != nil {
 		log.Fatal(err)
diff --git a/examples/websocket/main.go b/examples/websocket/main.go
index 1440948..1505a0f 100644
--- a/examples/websocket/main.go
+++ b/examples/websocket/main.go
@@ -26,7 +26,7 @@ func main() {
 
 	server := mqtt.New()
 	ws := listeners.NewWebsocket("ws1", ":1882")
-	err = server.AddListener(ws, nil)
+	err := server.AddListener(ws, nil)
 	if err != nil {
 		log.Fatal(err)
 	}