diff --git a/rust/platform/os/BUILD.bazel b/rust/platform/os/BUILD.bazel
new file mode 100644
index 0000000..7692abe
--- /dev/null
+++ b/rust/platform/os/BUILD.bazel
@@ -0,0 +1,11 @@
+constraint_value(
+    name = "unknown",
+    constraint_setting = "@platforms//os",
+    visibility = ["//visibility:public"],
+)
+
+constraint_value(
+    name = "wasi",
+    constraint_setting = "@platforms//os",
+    visibility = ["//visibility:public"],
+)