diff --git a/types/passport/index.d.ts b/types/passport/index.d.ts
index 0e612810d4..06c7f0b9db 100644
--- a/types/passport/index.d.ts
+++ b/types/passport/index.d.ts
@@ -4,6 +4,7 @@
 //                 Eric Naeseth <https://github.com/enaeseth>
 //                 Igor Belagorudsky <https://github.com/theigor>
 //                 Tomek Łaziuk <https://github.com/tlaziuk>
+//                 Daniel Perez Alvarez <https://github.com/danielpa9708>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -11,7 +12,7 @@ declare global {
     namespace Express {
         interface Request {
             authInfo?: any;
-            user?: any;
+            user?: User;
 
             // These declarations are merged into express's Request type
             login(user: any, done: (err: any) => void): void;
@@ -25,6 +26,9 @@ declare global {
             isAuthenticated(): boolean;
             isUnauthenticated(): boolean;
         }
+        interface User {
+            [_: string]: any;
+        }
     }
 }
 
diff --git a/types/passport/passport-tests.ts b/types/passport/passport-tests.ts
index 58c306964c..630091afc7 100644
--- a/types/passport/passport-tests.ts
+++ b/types/passport/passport-tests.ts
@@ -137,3 +137,23 @@ passportInstance.use(new TestStrategy());
 
 const authenticator = new passport.Authenticator();
 authenticator.use(new TestStrategy());
+
+declare global {
+    namespace Express {
+        interface User {
+            username: string;
+        }
+    }
+}
+
+app.use((req: express.Request, res: express.Response, next: (err?: any) => void) => {
+    if (req.user) {
+        if (req.user.username) {
+            req.user.username = "hello user";
+        }
+        if (req.user.id) {
+            req.user.id = "123";
+        }
+    }
+    next();
+});