diff --git a/types/koa-router/index.d.ts b/types/koa-router/index.d.ts
index 93473626fa..6763f8d7b8 100644
--- a/types/koa-router/index.d.ts
+++ b/types/koa-router/index.d.ts
@@ -89,7 +89,7 @@ declare namespace Router {
     }
     
     export interface IUrlOptionsQuery {
-        query?: object | string;
+        query: object | string;
     }
 
     export class ParamName {