diff --git a/src/Contracts/Types/Bytes.php b/src/Contracts/Types/Bytes.php
index f85fa03..d65a1c5 100644
--- a/src/Contracts/Types/Bytes.php
+++ b/src/Contracts/Types/Bytes.php
@@ -36,7 +36,7 @@ class Bytes extends SolidityType implements IType
      */
     public function isType($name)
     {
-        return (preg_match('/^bytes([0-9]{1,})(\[([0-9]*)\])*$/', $name) === 1);
+        return (preg_match('/^bytes([0-9]{1,})?(\[([0-9]*)\])*$/', $name) === 1);
     }
 
     /**