diff --git a/packages/nitro/src/presets/worker.ts b/packages/nitro/src/presets/worker.ts
index 2e082ea141..724e749752 100644
--- a/packages/nitro/src/presets/worker.ts
+++ b/packages/nitro/src/presets/worker.ts
@@ -1,13 +1,8 @@
-import { NitroPreset, NitroContext } from '../context'
+import { NitroPreset } from '../context'
 
 export const worker: NitroPreset = {
   entry: null, // Abstract
   node: false,
   minify: true,
-  inlineDynamicImports: true, // iffe does not support code-splitting
-  hooks: {
-    'nitro:rollup:before' ({ rollupConfig }: NitroContext) {
-      rollupConfig.output.format = 'iife'
-    }
-  }
+  inlineDynamicImports: true // iffe does not support code-splitting
 }