diff --git a/build.js b/build.js
index 99950d4..45af20a 100644
--- a/build.js
+++ b/build.js
@@ -1,7 +1,7 @@
 require('esbuild').buildSync({
   bundle: true,
   entryPoints: ['src/index.ts'],
-  external: ['zod'],
+  external: ['zod', '@remix-run/server-runtime'],
   outfile: 'dist/index.js',
   platform: 'node',
   target: ['node16'],