diff --git a/third_party/edk2/external.bzl b/third_party/edk2/external.bzl
new file mode 100644
index 0000000..6bb7325
--- /dev/null
+++ b/third_party/edk2/external.bzl
@@ -0,0 +1,27 @@
+#  Copyright 2020 The Monogon Project Authors.
+#
+#  SPDX-License-Identifier: Apache-2.0
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "new_git_repository")
+
+def edk2_external(name):
+    new_git_repository(
+        name = name,
+        build_file = "//third_party/edk2/external:BUILD.repo",
+        commit = "37eef91017ad042035090cae46557f9d6e2d5917",
+        init_submodules = True,
+        remote = "https://github.com/tianocore/edk2",
+        shallow_since = "1567048229 +0800",
+    )