diff --git a/code/lib/core-server/src/utils/getAccessControlMiddleware.ts b/code/lib/core-server/src/utils/getAccessControlMiddleware.ts
index 8dec9da2d69..9eb8851e6a5 100644
--- a/code/lib/core-server/src/utils/getAccessControlMiddleware.ts
+++ b/code/lib/core-server/src/utils/getAccessControlMiddleware.ts
@@ -1,4 +1,6 @@
-export function getAccessControlMiddleware(crossOriginIsolated: boolean) {
+import type { RequestHandler } from 'express';
+
+export function getAccessControlMiddleware(crossOriginIsolated: boolean): RequestHandler {
   return (req, res, next) => {
     res.header('Access-Control-Allow-Origin', '*');
     res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept');