diff --git a/authorization/plugin.go b/authorization/plugin.go
index ded43a9..1b65ac0 100644
--- a/authorization/plugin.go
+++ b/authorization/plugin.go
@@ -17,9 +17,14 @@ type Plugin interface {
 
 // NewPlugins constructs and initialize the authorization plugins based on plugin names
 func NewPlugins(names []string) []Plugin {
-	plugins := make([]Plugin, len(names))
-	for i, name := range names {
-		plugins[i] = newAuthorizationPlugin(name)
+	plugins := []Plugin{}
+	pluginsMap := make(map[string]struct{})
+	for _, name := range names {
+		if _, ok := pluginsMap[name]; ok {
+			continue
+		}
+		pluginsMap[name] = struct{}{}
+		plugins = append(plugins, newAuthorizationPlugin(name))
 	}
 	return plugins
 }
diff --git a/plugins/discovery.go b/plugins/discovery.go
index d0ee274..5ea8db5 100644
--- a/plugins/discovery.go
+++ b/plugins/discovery.go
@@ -13,7 +13,7 @@ import (
 
 var (
 	// ErrNotFound plugin not found
-	ErrNotFound = errors.New("Plugin not found")
+	ErrNotFound = errors.New("plugin not found")
 	socketsPath = "/run/docker/plugins"
 	specsPaths  = []string{"/etc/docker/plugins", "/usr/lib/docker/plugins"}
 )
diff --git a/plugins/plugins.go b/plugins/plugins.go
index f9e22d6..5ad4d89 100644
--- a/plugins/plugins.go
+++ b/plugins/plugins.go
@@ -96,7 +96,6 @@ func (p *Plugin) activateWithLock() error {
 		return err
 	}
 
-	logrus.Debugf("%s's manifest: %v", p.Name, m)
 	p.Manifest = m
 
 	for _, iface := range m.Implements {