diff --git a/rget/cmd/server.go b/rget/cmd/server.go
index 2cd4262..3c3b808 100644
--- a/rget/cmd/server.go
+++ b/rget/cmd/server.go
@@ -128,6 +128,10 @@ func (r sumRepo) handler(resp http.ResponseWriter, req *http.Request) {
 }
 
 func server(cmd *cobra.Command, args []string) {
+	if len(args) < 2 {
+		fmt.Printf("missing required arguments (public git URL, private git URL)\n")
+		os.Exit(1)
+	}
 	pubgit := args[0]
 	privgit := args[1]
 
@@ -161,7 +165,7 @@ func server(cmd *cobra.Command, args []string) {
 		}
 
 		if !strings.HasSuffix(host, "."+rgetwellknown.PublicServiceHost) {
-			return nil, errors.New(fmt.Sprintf("not in TLD %v", rgetwellknown.PublicServiceHost))
+			return nil, fmt.Errorf("not in TLD %v", rgetwellknown.PublicServiceHost)
 		}
 
 		key := strings.TrimSuffix(host, "."+rgetwellknown.PublicServiceHost)