diff --git a/command.go b/command.go
index 9832876..4bb12a8 100644
--- a/command.go
+++ b/command.go
@@ -156,7 +156,8 @@ func (cmd *baseCmd) stringArg(pos int) string {
 	case string:
 		return v
 	default:
-		return fmt.Sprintf("%v", v)
+		// TODO: consider using appendArg
+		return fmt.Sprint(v)
 	}
 }