diff --git a/ui/tsup.config.ts b/ui/tsup.config.ts
index ab69e712..60bdd75b 100644
--- a/ui/tsup.config.ts
+++ b/ui/tsup.config.ts
@@ -5,6 +5,7 @@ export default defineConfig({
   outDir: "../octoprint_octorelay/static/js",
   format: "cjs",
   outExtension: () => ({ js: ".js" }),
+  platform: "browser",
   splitting: false,
   sourcemap: false,
   clean: true,