diff --git a/code/builders/builder-manager/src/index.ts b/code/builders/builder-manager/src/index.ts
index c13f0daa87f1..eb869bb54f2a 100644
--- a/code/builders/builder-manager/src/index.ts
+++ b/code/builders/builder-manager/src/index.ts
@@ -45,7 +45,7 @@ export const getConfig: ManagerBuilder['getConfig'] = async (options) => {
   return {
     entryPoints: realEntryPoints,
     outdir: join(options.outputDir || './', 'sb-addons'),
-    format: 'esm',
+    format: 'iife',
     write: false,
     ignoreAnnotations: true,
     resolveExtensions: ['.ts', '.tsx', '.mjs', '.js', '.jsx'],