diff --git a/index.d.ts b/index.d.ts
index 7cff3ed7ca..2985de3b49 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -518,7 +518,7 @@ declare module 'egg' {
       };
       xframe: {
         enable: boolean;
-        value: 'SAMEORIGIN' | 'DENY' | 'ALLOW-FROM';
+        value: 'SAMEORIGIN' | 'DENY' | string;
       };
       hsts: any;
       methodnoallow: { enable: boolean };