diff --git a/scripts/build-piper.mjs b/scripts/build-piper.mjs
index 1aaceba..eff08db 100644
--- a/scripts/build-piper.mjs
+++ b/scripts/build-piper.mjs
@@ -33,6 +33,7 @@ await build({
   format: 'iife',
   platform: 'browser',
   target: ['es2022'],
+  external: ['fs', 'path'],
   sourcemap: false,
   legalComments: 'none',
 });
@@ -44,6 +45,7 @@ await build({
   format: 'iife',
   platform: 'browser',
   target: ['es2022'],
+  external: ['fs', 'path'],
   sourcemap: false,
   legalComments: 'none',
 });