diff --git a/connect-mongo/connect-mongo.d.ts b/connect-mongo/connect-mongo.d.ts
index ece75973a..cb39d42cf 100644
--- a/connect-mongo/connect-mongo.d.ts
+++ b/connect-mongo/connect-mongo.d.ts
@@ -99,7 +99,7 @@ declare module "connect-mongo" {
             new (options: NaitiveMongoOptions): MongoStore;
         }
 
-        export class MongoStore implements session.Store {
+        export class MongoStore extends session.Store {
             get: (sid: string, callback: (err: any, session: Express.Session) => void) => void;
             set: (sid: string, session: Express.Session, callback: (err: any) => void) => void;
             destroy: (sid: string, callback: (err: any) => void) => void;
diff --git a/express-session/express-session.d.ts b/express-session/express-session.d.ts
index 5e32e3b7e..035a36bce 100644
--- a/express-session/express-session.d.ts
+++ b/express-session/express-session.d.ts
@@ -4,6 +4,7 @@
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 /// <reference path="../express/express.d.ts" />
+/// <reference path="../node/node.d.ts" />
 
 declare module Express {
 
@@ -36,6 +37,7 @@ declare module Express {
 
 declare module "express-session" {
   import express = require('express');
+  import node = require('events');
 
   function session(options?: session.SessionOptions): express.RequestHandler;
 
@@ -43,7 +45,7 @@ declare module "express-session" {
     export interface SessionOptions {
       secret: string;
       name?: string;
-      store?: Store;
+      store?: Store | MemoryStore;
       cookie?: express.CookieOptions;
       genid?: (req: express.Request) => string;
       rolling?: boolean;
@@ -52,15 +54,24 @@ declare module "express-session" {
       saveUninitialized?: boolean;
       unset?: string;
     }
-
-    export interface Store {
+	
+	export interface BaseMemoryStore {
       get: (sid: string, callback: (err: any, session: Express.Session) => void) => void;
       set: (sid: string, session: Express.Session, callback: (err: any) => void) => void;
       destroy: (sid: string, callback: (err: any) => void) => void;
       length?: (callback: (err: any, length: number) => void) => void;
       clear?: (callback: (err: any) => void) => void;
     }
-    export class MemoryStore implements Store {
+	
+    export abstract class Store extends node.EventEmitter {
+	  constructor(config?: any);
+	  
+	  regenerate (req: express.Request, fn: (err: any) => any): void;
+      load (sid: string, fn: (err: any, session: Express.Session) => any): void;
+      createSession (req: express.Request, sess: Express.Session): void;
+    }
+  
+    export class MemoryStore implements BaseMemoryStore {
       get: (sid: string, callback: (err: any, session: Express.Session) => void) => void;
       set: (sid: string, session: Express.Session, callback: (err: any) => void) => void;
       destroy: (sid: string, callback: (err: any) => void) => void;