diff --git a/mongoose/index.d.ts b/mongoose/index.d.ts
index 150d94b2df..12c92571b5 100644
--- a/mongoose/index.d.ts
+++ b/mongoose/index.d.ts
@@ -871,7 +871,7 @@ declare module "mongoose" {
     /** Hash containing current validation errors. */
     errors: Object;
     /** This documents _id. */
-    _id: any;
+    _id: mongodb.ObjectID;
     /** Boolean flag specifying if the document is new. */
     isNew: boolean;
     /** The documents schema. */
diff --git a/passport-local-mongoose/passport-local-mongoose-tests.ts b/passport-local-mongoose/passport-local-mongoose-tests.ts
index 7b428561fe..21a928a8d7 100644
--- a/passport-local-mongoose/passport-local-mongoose-tests.ts
+++ b/passport-local-mongoose/passport-local-mongoose-tests.ts
@@ -23,7 +23,6 @@ import { Strategy as LocalStrategy } from 'passport-local';
 
 //#region Test Models
 interface User extends PassportLocalDocument {
-    _id: string;
     username: string;
     hash: string;
     salt: string;