diff --git a/metropolis/pkg/logtree/proto/BUILD.bazel b/metropolis/pkg/logtree/proto/BUILD.bazel
new file mode 100644
index 0000000..e7f8c82
--- /dev/null
+++ b/metropolis/pkg/logtree/proto/BUILD.bazel
@@ -0,0 +1,24 @@
+load("@rules_proto//proto:defs.bzl", "proto_library")
+load("@io_bazel_rules_go//go:def.bzl", "go_library")
+load("@io_bazel_rules_go//proto:def.bzl", "go_proto_library")
+
+proto_library(
+    name = "proto_proto",
+    srcs = ["logtree.proto"],
+    visibility = ["//visibility:public"],
+    deps = ["@com_google_protobuf//:timestamp_proto"],
+)
+
+go_proto_library(
+    name = "proto_go_proto",
+    importpath = "source.monogon.dev/metropolis/pkg/logtree/proto",
+    proto = ":proto_proto",
+    visibility = ["//visibility:public"],
+)
+
+go_library(
+    name = "proto",
+    embed = [":proto_go_proto"],
+    importpath = "source.monogon.dev/metropolis/pkg/logtree/proto",
+    visibility = ["//visibility:public"],
+)