diff --git a/middlewares/utils.ts b/middlewares/utils.ts
index 47cb5873d..0d559c2a4 100644
--- a/middlewares/utils.ts
+++ b/middlewares/utils.ts
@@ -36,13 +36,14 @@ export function getDefaultRequestHeaders(request: NextRequest) {
   return headers
 }
 
-type ContentStackResponse = {
-  contentType: string | null
-  uid: string | null
-  expiresAt: number
-}
-
-const entryResponseCache: Map<string, ContentStackResponse> = new Map()
+const entryResponseCache: Map<
+  string,
+  {
+    contentType: string | null
+    uid: string | null
+    expiresAt: number
+  }
+> = new Map()
 let size: number = 0
 
 export const fetchAndCacheEntry = async (path: string, lang?: Lang) => {