diff --git a/mirzaev/currencies/system/currency.php b/mirzaev/currencies/system/currency.php
index 30990b3..771f79e 100644
--- a/mirzaev/currencies/system/currency.php
+++ b/mirzaev/currencies/system/currency.php
@@ -15,10 +15,10 @@ use	mirzaev\languages\language;
  * @license http://www.wtfpl.net/ Do What The Fuck You Want To Public License
  * @author Arsen Mirzaev Tatyano-Muradovich <arsen@mirzaev.sexy>
  */
-enum currency
+enum currency: string
 {
-	case usd;
-	case rub;
+	case usd = 'USD';
+	case rub = 'RUB';
 
 	/**
    * Label