diff --git a/src/middleware.ts b/src/middleware.ts
index da1c0f1bd..b663f2d4e 100644
--- a/src/middleware.ts
+++ b/src/middleware.ts
@@ -228,7 +228,9 @@ export async function middleware(request: NextRequest) {
     }
 
     if (resolved.cacheTags && resolved.cacheTags.length > 0) {
-        response.headers.set('cache-tag', resolved.cacheTags.join(','));
+        const headerCacheTag = resolved.cacheTags.join(',');
+        response.headers.set('cache-tag', headerCacheTag);
+        response.headers.set('x-gitbook-cache-tag', headerCacheTag);
     }
 
     return response;