diff --git a/metropolis/installer/test/testos/BUILD.bazel b/metropolis/installer/test/testos/BUILD.bazel
index c8f1c3f..e8d8700 100644
--- a/metropolis/installer/test/testos/BUILD.bazel
+++ b/metropolis/installer/test/testos/BUILD.bazel
@@ -1,6 +1,7 @@
 load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
 load("@rules_pkg//:pkg.bzl", "pkg_zip")
 load("//osbase/build/mkerofs:def.bzl", "erofs_image")
+load("//osbase/build/mkoci:def.bzl", "oci_os_image")
 load("//osbase/build/mkpayload:def.bzl", "efi_unified_kernel_image")
 load("//osbase/build/mkverity:def.bzl", "verity_image")
 
@@ -35,6 +36,15 @@
     visibility = ["//visibility:public"],
 )
 
+oci_os_image(
+    name = "testos_image",
+    srcs = {
+        "system": ":verity_rootfs",
+        "kernel.efi": ":kernel_efi",
+    },
+    visibility = ["//visibility:public"],
+)
+
 go_library(
     name = "testos_lib",
     srcs = ["main.go"],