diff --git a/test/model.hydrate.test.js b/test/model.hydrate.test.js
index 6cdc333ce8d..cabdf7d225f 100644
--- a/test/model.hydrate.test.js
+++ b/test/model.hydrate.test.js
@@ -99,5 +99,23 @@ describe('model', function() {
       assert.equal(hydrated.test, 'test');
       assert.deepEqual(hydrated.schema.tree, C.schema.tree);
     });
+    it('should deeply hydrate the document with the `hydratedPopulatedDocs` option (gh-4727)', async function() {
+      const userSchema = new Schema({
+        name: String
+      });
+      const companySchema = new Schema({
+        name: String,
+        users: [{ ref: 'User', type: Schema.Types.ObjectId }]
+      });
+
+      const User = db.model('UserTestHydrate', userSchema);
+      const Company = db.model('CompanyTestHyrdrate', companySchema);
+
+      const users = [{ _id: new Schema.ObjectId(), name: 'Val'}];
+      const company = { _id: new Schema.ObjectId(), name: 'Booster', users: [users[0]] };
+
+      const C = Company.hydrate(company, null, { hydratedPopulatedDocs: true });
+      assert.equal(C.users[0].name, 'Val');
+    });
   });
 });