diff --git a/lib/document.js b/lib/document.js
index bdb6e2e57df..d907886ece3 100644
--- a/lib/document.js
+++ b/lib/document.js
@@ -4066,7 +4066,8 @@ Document.prototype.toObject = function(options) {
 
 function applyVirtuals(self, json, options, toObjectOptions) {
   const schema = self.$__schema;
-  const paths = Object.keys(schema.virtuals);
+  const virtuals = schema.virtuals;
+  const paths = Object.keys(virtuals);
   let i = paths.length;
   const numPaths = i;
   let path;
@@ -4117,7 +4118,7 @@ function applyVirtuals(self, json, options, toObjectOptions) {
       assignPath = path.substring(options.path.length + 1);
     }
     if (assignPath.indexOf('.') === -1 && assignPath === path) {
-      v = self.get(path, null, { noDottedPath: true });
+      v = virtuals[path].applyGetters(void 0, self);
       v = clone(v, options);
       if (v === void 0) {
         continue;
diff --git a/lib/helpers/schema/idGetter.js b/lib/helpers/schema/idGetter.js
index 1fe7cc77ab3..5b576531272 100644
--- a/lib/helpers/schema/idGetter.js
+++ b/lib/helpers/schema/idGetter.js
@@ -27,7 +27,7 @@ module.exports = function addIdGetter(schema) {
 
 function idGetter() {
   if (this._id != null) {
-    return String(this._id);
+    return this._id.toString();
   }
 
   return null;
diff --git a/test/document.unit.test.js b/test/document.unit.test.js
index dbae16908ac..d5b84176a35 100644
--- a/test/document.unit.test.js
+++ b/test/document.unit.test.js
@@ -37,12 +37,11 @@ describe('toObject()', function() {
 
   beforeEach(function() {
     Stub = function() {
-      const schema = this.$__schema = {
+      this.$__schema = {
         options: { toObject: { minimize: false, virtuals: true } },
-        virtuals: { virtual: 'test' }
+        virtuals: { virtual: { applyGetters: () => 'test' } }
       };
       this._doc = { empty: {} };
-      this.get = function(path) { return schema.virtuals[path]; };
       this.$__ = {};
     };
     Stub.prototype = Object.create(mongoose.Document.prototype);