diff --git a/defaults/main.yaml b/defaults/main.yaml
index a5a5db2c2..5841c1b43 100644
--- a/defaults/main.yaml
+++ b/defaults/main.yaml
@@ -56,6 +56,8 @@ metal_stack_release:
     gardener_machine_controller_manager_image_name: "docker-images.metal-stack.gardener.machine-controller-manager.name"
     gardener_mcm_provider_metal_image_name: "docker-images.metal-stack.gardener.machine-controller-manager-provider-metal.name"
     gardener_mcm_provider_metal_image_tag: "docker-images.metal-stack.gardener.machine-controller-manager-provider-metal.tag"
+    gardener_extension_audit_image_name: "docker-images.metal-stack.gardener.gardener-extension-audit.name"
+    gardener_extension_audit_image_tag: "docker-images.metal-stack.gardener.gardener-extension-audit.tag"
     # kubernetes
     csi_lvm_controller_image_tag: "docker-images.metal-stack.kubernetes.csi-lvm-controller.tag"
     csi_lvm_controller_image_name: "docker-images.metal-stack.kubernetes.csi-lvm-controller.name"