diff --git a/src/DelegatingContainer.php b/src/DelegatingContainer.php
index 2690f1d..f113618 100644
--- a/src/DelegatingContainer.php
+++ b/src/DelegatingContainer.php
@@ -39,6 +39,7 @@ public function __construct(ServiceProviderInterface $provider, PsrContainerInte
      */
     public function get($id)
     {
+        $id = (string) $id;
         static $stack = [];
 
         if (array_key_exists($id, $stack)) {