diff --git a/cmd/kubeadm/app/cmd/token.go b/cmd/kubeadm/app/cmd/token.go
index f21b22934b2..ac6f30117e9 100644
--- a/cmd/kubeadm/app/cmd/token.go
+++ b/cmd/kubeadm/app/cmd/token.go
@@ -213,8 +213,7 @@ func RunCreateToken(out io.Writer, client clientset.Interface, token string, tok
 	}
 
 	// adding groups only makes sense for authentication
-	var usagesSet sets.String
-	usagesSet.Insert(usages...)
+	usagesSet := sets.NewString(usages...)
 	if len(extraGroups) > 0 && !usagesSet.Has("authentication") {
 		return fmt.Errorf("--groups cannot be specified unless --usages includes \"authentication\"")
 	}