diff --git a/koa/koa.d.ts b/koa/koa.d.ts
index 0e9c49f6b..2520f8fae 100644
--- a/koa/koa.d.ts
+++ b/koa/koa.d.ts
@@ -11,94 +11,13 @@
  =============================================== */
 
 /// <reference path="../node/node.d.ts" />
+/// <reference path="../cookies/cookies.d.ts" />
 
 declare module "koa" {
     import * as net from 'net';
     import * as http from 'http';
     import * as events from 'events';
-    
-    // waiting https://github.com/DefinitelyTyped/DefinitelyTyped/pull/7311 be merged
-    // import * as Cookies from 'cookies';
-    module Cookies {
-        interface ICookies {
-            /**
-             * This extracts the cookie with the given name from the
-             * Cookie header in the request. If such a cookie exists,
-             * its value is returned. Otherwise, nothing is returned.
-             */
-            get(name: string): string;
-            /**
-             * This extracts the cookie with the given name from the
-             * Cookie header in the request. If such a cookie exists,
-             * its value is returned. Otherwise, nothing is returned.
-             */
-            get(name: string, opts: IOptions): string;
-            
-            /**
-             * This sets the given cookie in the response and returns 
-             * the current context to allow chaining.If the value is omitted, 
-             * an outbound header with an expired date is used to delete the cookie.
-             */
-            set(name: string, value: string): ICookies;
-            /**
-             * This sets the given cookie in the response and returns 
-             * the current context to allow chaining.If the value is omitted, 
-             * an outbound header with an expired date is used to delete the cookie.
-             */
-            set(name: string, value: string, opts: IOptions): ICookies;
-        }
-
-        interface IOptions {
-            /**
-             * a number representing the milliseconds from Date.now() for expiry
-             */
-            maxAge?: number;
-            /**
-             * a Date object indicating the cookie's expiration
-             * date (expires at the end of session by default).
-             */
-            expires?: Date;
-            /**
-             * a string indicating the path of the cookie (/ by default).
-             */
-            path?: string;
-            /**
-             * a string indicating the domain of the cookie (no default).
-             */
-            domain?: string;
-            /**
-             * a boolean indicating whether the cookie is only to be sent
-             * over HTTPS (false by default for HTTP, true by default for HTTPS).
-             */
-            secure?: boolean;
-            /**
-             * a boolean indicating whether the cookie is only to be sent
-             * over HTTPS (use this if you handle SSL not in your node process).
-             */
-            secureProxy?: boolean;
-            /**
-             * a boolean indicating whether the cookie is only to be sent over HTTP(S),
-             * and not made available to client JavaScript (true by default).
-             */
-            httpOnly?: boolean;
-            /**
-             * a boolean indicating whether the cookie is to be signed (false by default).
-             * If this is true, another cookie of the same name with the .sig suffix
-             * appended will also be sent, with a 27-byte url-safe base64 SHA1 value
-             * representing the hash of cookie-name=cookie-value against the first Keygrip key.
-             * This signature key is used to detect tampering the next time a cookie is received.
-             */
-            signed?: boolean;
-            /**
-             * a boolean indicating whether to overwrite previously set
-             * cookies of the same name (false by default). If this is true,
-             * all cookies set during the same request with the same
-             * name (regardless of path or domain) are filtered out of
-             * the Set-Cookie header when setting this cookie.
-             */
-            overwrite?: boolean;
-        }
-    }
+    import * as Cookies from 'cookies';
 
     interface IRequest {
             /**