diff --git a/src/AddOn/AbstractAddOn.php b/src/AddOn/AbstractAddOn.php
new file mode 100644
index 0000000..fc771bc
--- /dev/null
+++ b/src/AddOn/AbstractAddOn.php
@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Mammatus\Kubernetes\Contracts\AddOn;
+
+interface AbstractAddOn extends \JsonSerializable
+{
+    /**
+     * The Helper to call
+     */
+    public function helper(): string;
+}
diff --git a/src/AddOn/Container.php b/src/AddOn/Container.php
index f7e063d..c1e0bae 100644
--- a/src/AddOn/Container.php
+++ b/src/AddOn/Container.php
@@ -4,10 +4,6 @@
 
 namespace Mammatus\Kubernetes\Contracts\AddOn;
 
-interface Container
+interface Container extends AbstractAddOn
 {
-    /**
-     * The Helper to call
-     */
-    public function helper(): string;
 }
diff --git a/src/AddOn/Deployment.php b/src/AddOn/Deployment.php
index 464d42a..45d1797 100644
--- a/src/AddOn/Deployment.php
+++ b/src/AddOn/Deployment.php
@@ -4,10 +4,6 @@
 
 namespace Mammatus\Kubernetes\Contracts\AddOn;
 
-interface Deployment
+interface Deployment extends AbstractAddOn
 {
-    /**
-     * The Helper to call
-     */
-    public function helper(): string;
 }