diff --git a/osbase/build/mkucode/BUILD.bazel b/osbase/build/mkucode/BUILD.bazel
new file mode 100644
index 0000000..9f56e10
--- /dev/null
+++ b/osbase/build/mkucode/BUILD.bazel
@@ -0,0 +1,19 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_binary", "go_library")
+
+go_library(
+    name = "mkucode_lib",
+    srcs = ["main.go"],
+    importpath = "source.monogon.dev/osbase/build/mkucode",
+    visibility = ["//visibility:private"],
+    deps = [
+        "//osbase/build/mkucode/spec",
+        "@com_github_cavaliergopher_cpio//:cpio",
+        "@org_golang_google_protobuf//encoding/prototext",
+    ],
+)
+
+go_binary(
+    name = "mkucode",
+    embed = [":mkucode_lib"],
+    visibility = ["//visibility:public"],
+)