@@ -32,13 +32,13 @@ func (e *executor) Describe(ctx context.Context) (*api.NodeDescription, error) {

 		return nil, err

 	}

-	var plugins []api.PluginDescription

+	plugins := map[api.PluginDescription]struct{}{}

 	addPlugins := func(typ string, names []string) {

 		for _, name := range names {

-			plugins = append(plugins, api.PluginDescription{

+			plugins[api.PluginDescription{

 				Type: typ,

 				Name: name,

-			})

+			}] = struct{}{}

 		}

 	}

@@ -48,7 +48,12 @@ func (e *executor) Describe(ctx context.Context) (*api.NodeDescription, error) {

 	addPlugins("Network", append([]string{"overlay"}, info.Plugins.Network...))

 	addPlugins("Authorization", info.Plugins.Authorization)

-	sort.Sort(sortedPlugins(plugins))

+	pluginFields := make([]api.PluginDescription, 0, len(plugins))

+	for k := range plugins {

+		pluginFields = append(pluginFields, k)

+	}

+

+	sort.Sort(sortedPlugins(pluginFields))

 	// parse []string labels into a map[string]string

 	labels := map[string]string{}

@@ -70,7 +75,7 @@ func (e *executor) Describe(ctx context.Context) (*api.NodeDescription, error) {

 		Engine: &api.EngineDescription{

 			EngineVersion: info.ServerVersion,

 			Labels:        labels,

-			Plugins:       plugins,

+			Plugins:       pluginFields,

 		},

 		Resources: &api.Resources{

 			NanoCPUs:    int64(info.NCPU) * 1e9,