diff --git a/bazel/spec-bundling/index_rjs.bzl b/bazel/spec-bundling/index_rjs.bzl
index 5108bb795..b9c5cf1aa 100644
--- a/bazel/spec-bundling/index_rjs.bzl
+++ b/bazel/spec-bundling/index_rjs.bzl
@@ -31,7 +31,7 @@ def spec_bundle(name, deps, srcs = [], bootstrap = [], testonly = True, config =
         bundle = True,
         format = "iife",
         sourcemap = "linked",
-        platform = "node",
+        platform = kwargs.pop("platform", "node"),
         entry_point = ":%s_entrypoint" % name,
         output = "%s.spec.js" % name,
         **kwargs