diff --git a/package.json b/package.json
index d604069cb03..a23195de38f 100644
--- a/package.json
+++ b/package.json
@@ -50,6 +50,7 @@
     "eslint-plugin-markdown": "^3.0.0",
     "eslint-plugin-mocha-no-only": "1.1.1",
     "express": "^4.18.1",
+    "fs-extra": "~11.1.1",
     "highlight.js": "11.7.0",
     "lodash.isequal": "4.5.0",
     "lodash.isequalwith": "4.4.0",
@@ -67,8 +68,7 @@
     "tsd": "0.25.0",
     "typescript": "4.9.5",
     "uuid": "9.0.0",
-    "webpack": "5.75.0",
-    "fs-extra": "~11.1.1"
+    "webpack": "5.75.0"
   },
   "directories": {
     "lib": "./lib/mongoose"
diff --git a/test/types/mongo.test.ts b/test/types/mongo.test.ts
new file mode 100644
index 00000000000..f3b22e59f2f
--- /dev/null
+++ b/test/types/mongo.test.ts
@@ -0,0 +1,17 @@
+import * as mongoose from 'mongoose';
+import { expectType } from 'tsd';
+import * as bson from 'bson';
+
+function gh12537() {
+  const schema = new mongoose.Schema({ test: String });
+  const model = mongoose.model('Test', schema);
+
+  const doc = new model({});
+
+  const v = new bson.ObjectId('somehex');
+  expectType<string>(v._id.toHexString());
+
+  doc._id = new bson.ObjectId('somehex');
+}
+
+gh12537();
diff --git a/types/augmentations.d.ts b/types/augmentations.d.ts
new file mode 100644
index 00000000000..fe72cb1aa3f
--- /dev/null
+++ b/types/augmentations.d.ts
@@ -0,0 +1,9 @@
+// this import is required so that types get merged instead of completely overwritten
+import 'bson';
+
+declare module 'bson' {
+  interface ObjectId {
+    /** Mongoose automatically adds a conveniency "_id" getter on the base ObjectId class */
+    _id: this;
+  }
+}
\ No newline at end of file
diff --git a/types/index.d.ts b/types/index.d.ts
index ac24805858c..8a12e688a4d 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -22,6 +22,7 @@
 /// <reference path="./validation.d.ts" />
 /// <reference path="./inferschematype.d.ts" />
 /// <reference path="./virtuals.d.ts" />
+/// <reference path="./augmentations.d.ts" />
 
 declare class NativeDate extends global.Date { }
 
diff --git a/types/types.d.ts b/types/types.d.ts
index f782b7cf004..75a918c754d 100644
--- a/types/types.d.ts
+++ b/types/types.d.ts
@@ -80,7 +80,7 @@ declare module 'mongoose' {
     }
 
     class ObjectId extends mongodb.ObjectId {
-      _id: this;
+
     }
 
     class Subdocument<IdType = any> extends Document<IdType> {