diff --git a/src/NotFoundExceptionInterface.php b/src/NotFoundExceptionInterface.php
index 3ac8891..650bf46 100644
--- a/src/NotFoundExceptionInterface.php
+++ b/src/NotFoundExceptionInterface.php
@@ -5,6 +5,6 @@
 /**
  * No entry was found in the container.
  */
-interface NotFoundExceptionInterface
+interface NotFoundExceptionInterface extends ContainerExceptionInterface
 {
 }