diff --git a/src/Potter/Stringable/StringableInterface.php b/src/Potter/Stringable/StringableInterface.php
index 3a1667e..340f81b 100644
--- a/src/Potter/Stringable/StringableInterface.php
+++ b/src/Potter/Stringable/StringableInterface.php
@@ -4,7 +4,9 @@ declare(strict_types=1);
 
 namespace Potter\Stringable;
 
-interface StringableInterface 
-{
+use \Stringable;
 
+interface StringableInterface extends Stringable
+{
+    public function __toString(): string;
 }