diff --git a/src/finalisers/iife.ts b/src/finalisers/iife.ts
index 706e2f62429..5f5aec49a33 100644
--- a/src/finalisers/iife.ts
+++ b/src/finalisers/iife.ts
@@ -49,6 +49,7 @@ export default function iife(
 
 	if (hasExports && !name) {
 		warn({
+			code: 'MISSING_NAME_OPTION_FOR_IIFE_EXPORT',
 			message: `If you do not supply "output.name", you may not be able to access the exports of an IIFE bundle.`
 		});
 	}
diff --git a/test/function/samples/warn-missing-iife-name/_config.js b/test/function/samples/warn-missing-iife-name/_config.js
index 2326bd1f959..07c9331fb90 100644
--- a/test/function/samples/warn-missing-iife-name/_config.js
+++ b/test/function/samples/warn-missing-iife-name/_config.js
@@ -3,6 +3,7 @@ module.exports = {
 	options: { output: { format: 'iife' } },
 	warnings: [
 		{
+			code: 'MISSING_NAME_OPTION_FOR_IIFE_EXPORT',
 			message:
 				'If you do not supply "output.name", you may not be able to access the exports of an IIFE bundle.'
 		}