diff --git a/metropolis/pkg/loop/BUILD.bazel b/metropolis/pkg/loop/BUILD.bazel
new file mode 100644
index 0000000..1bf0722
--- /dev/null
+++ b/metropolis/pkg/loop/BUILD.bazel
@@ -0,0 +1,25 @@
+load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
+load("//metropolis/test/ktest:ktest.bzl", "ktest")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["loop.go"],
+    importpath = "source.monogon.dev/metropolis/pkg/loop",
+    visibility = ["//visibility:public"],
+    deps = ["@org_golang_x_sys//unix:go_default_library"],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["loop_test.go"],
+    embed = [":go_default_library"],
+    deps = [
+        "@com_github_stretchr_testify//assert:go_default_library",
+        "@com_github_stretchr_testify//require:go_default_library",
+        "@org_golang_x_sys//unix:go_default_library",
+    ],
+)
+
+ktest(
+    tester = ":go_default_test",
+)