diff --git a/types/connect-mongo/index.d.ts b/types/connect-mongo/index.d.ts
index ee110ab6b0..ea39a13f42 100644
--- a/types/connect-mongo/index.d.ts
+++ b/types/connect-mongo/index.d.ts
@@ -104,12 +104,12 @@ declare namespace connectMongo {
     }
 
     export class MongoStore extends session.Store {
-        get: (sid: string, callback: (err: any, session: Express.Session | null) => void) => void;
-        set: (sid: string, session: Express.Session, callback?: (err: any) => void) => void;
+        get: (sid: string, callback: (err: any, session: Express.SessionData | null) => void) => void;
+        set: (sid: string, session: Express.SessionData, 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;
-        touch: (sid: string, session: Express.Session, callback?: (err: any) => void) => void;
+        touch: (sid: string, session: Express.SessionData, callback?: (err: any) => void) => void;
     }
 }
 
diff --git a/types/express-session/express-session-tests.ts b/types/express-session/express-session-tests.ts
index 9189db1dfb..dc52a31a73 100644
--- a/types/express-session/express-session-tests.ts
+++ b/types/express-session/express-session-tests.ts
@@ -54,7 +54,7 @@ class MyStore extends session.Store {
     callback(null, sessionData);
   }
 
-  set = (sid: string, session: Express.Session, callback?: (err?: any) => void): void => {
+  set = (sid: string, session: Express.SessionData, callback?: (err?: any) => void): void => {
     this.sessions[sid] = JSON.stringify(session);
     if (callback) callback();
   }
diff --git a/types/express-session/index.d.ts b/types/express-session/index.d.ts
index fdceafeeea..d26fbb6af8 100644
--- a/types/express-session/index.d.ts
+++ b/types/express-session/index.d.ts
@@ -79,26 +79,26 @@ declare namespace session {
     constructor(config?: any);
 
     regenerate: (req: express.Request, fn: (err?: any) => any) => void;
-    load: (sid: string, fn: (err: any, session?: Express.Session | null) => any) => void;
+    load: (sid: string, fn: (err: any, session?: Express.SessionData | null) => any) => void;
     createSession: (req: express.Request, sess: Express.SessionData) => void;
 
     get: (sid: string, callback: (err: any, session?: Express.SessionData | null) => void) => void;
-    set: (sid: string, session: Express.Session, callback?: (err?: any) => void) => void;
+    set: (sid: string, session: Express.SessionData, callback?: (err?: any) => void) => void;
     destroy: (sid: string, callback?: (err?: any) => void) => void;
     all: (callback: (err: any, obj?: { [sid: string]: Express.SessionData; } | null) => void) => void;
     length: (callback: (err: any, length?: number | null) => void) => void;
     clear: (callback?: (err?: any) => void) => void;
-    touch: (sid: string, session: Express.Session, callback?: (err?: any) => void) => void;
+    touch: (sid: string, session: Express.SessionData, callback?: (err?: any) => void) => void;
   }
 
   class MemoryStore implements BaseMemoryStore {
     get: (sid: string, callback: (err: any, session?: Express.SessionData | null) => void) => void;
-    set: (sid: string, session: Express.Session, callback?: (err?: any) => void) => void;
+    set: (sid: string, session: Express.SessionData, callback?: (err?: any) => void) => void;
     destroy: (sid: string, callback?: (err?: any) => void) => void;
-    all: (callback: (err: any, obj?: { [sid: string]: Express.Session; } | null) => void) => void;
+    all: (callback: (err: any, obj?: { [sid: string]: Express.SessionData; } | null) => void) => void;
     length: (callback: (err: any, length?: number | null) => void) => void;
     clear: (callback?: (err?: any) => void) => void;
-    touch: (sid: string, session: Express.Session, callback?: (err?: any) => void) => void;
+    touch: (sid: string, session: Express.SessionData, callback?: (err?: any) => void) => void;
   }
 }