diff --git a/packages/core/src/config.ts b/packages/core/src/config.ts
index 277df2f0f..43f224624 100644
--- a/packages/core/src/config.ts
+++ b/packages/core/src/config.ts
@@ -695,6 +695,15 @@ const composeFormatConfig = ({
       }
 
       const config: EnvironmentConfig = {
+        output: {
+          minify: {
+            jsOptions: {
+              minimizerOptions: {
+                module: true,
+              },
+            },
+          },
+        },
         tools: {
           rspack: {
             module: {
diff --git a/packages/core/tests/__snapshots__/config.test.ts.snap b/packages/core/tests/__snapshots__/config.test.ts.snap
index ed84621f4..7c70d128a 100644
--- a/packages/core/tests/__snapshots__/config.test.ts.snap
+++ b/packages/core/tests/__snapshots__/config.test.ts.snap
@@ -856,6 +856,7 @@ exports[`Should compose create Rsbuild config correctly > Merge Rsbuild config i
               },
               "mangle": false,
               "minify": false,
+              "module": true,
             },
           },
         },
diff --git a/tests/integration/iife/index.test.ts b/tests/integration/iife/index.test.ts
index d3b1c7a3e..a6fa48d00 100644
--- a/tests/integration/iife/index.test.ts
+++ b/tests/integration/iife/index.test.ts
@@ -14,8 +14,10 @@ test('iife', async () => {
   });
 
   globalThis.globalHelper = { helperName: 'HELPER_NAME' };
-  require(entryFiles.iife);
-  expect(globalThis.addPrefix('ok')).toBe('production: HELPER_NAMEok');
+  await import(entryFiles.iife);
+  expect(globalThis.addPrefix('ok')).toMatchInlineSnapshot(
+    `"<ROOT>/tests/integration/iife/dist/iife/index.mjs - production: HELPER_NAMEok"`,
+  );
   delete process.env.NODE_ENV;
   delete globalThis.globalHelper;
 
@@ -24,7 +26,7 @@ test('iife', async () => {
     "(()=>{
         "use strict";
         const external_globalHelper_namespaceObject = globalThis.globalHelper;
-        const addPrefix = (prefix, str, env)=>\`\${env}: \${prefix}\${str}\`;
+        const addPrefix = (prefix, str, env)=>\`\${import.meta.url} - \${env}: \${prefix}\${str}\`;
         globalThis.addPrefix = (str)=>addPrefix(external_globalHelper_namespaceObject.helperName, str, "production");
     })();
     "
diff --git a/tests/integration/iife/rslib.config.ts b/tests/integration/iife/rslib.config.ts
index c795a68d9..ef9935b47 100644
--- a/tests/integration/iife/rslib.config.ts
+++ b/tests/integration/iife/rslib.config.ts
@@ -6,6 +6,9 @@ export default defineConfig({
     generateBundleIifeConfig({
       output: {
         externals: ['globalHelper'],
+        filename: {
+          js: '[name].mjs',
+        },
       },
     }),
   ],
diff --git a/tests/integration/iife/src/utils.ts b/tests/integration/iife/src/utils.ts
index 344a05ce7..edede7887 100644
--- a/tests/integration/iife/src/utils.ts
+++ b/tests/integration/iife/src/utils.ts
@@ -1,4 +1,5 @@
-const addPrefix = (prefix: string, str: string, env: string) =>
-  `${env}: ${prefix}${str}`;
+const addPrefix = (prefix: string, str: string, env: string): string => {
+  return `${import.meta.url} - ${env}: ${prefix}${str}`;
+};
 
 export { addPrefix };