diff --git a/lib/schema/subdocument.js b/lib/schema/subdocument.js
index 1963f908a43..ce07826d4ff 100644
--- a/lib/schema/subdocument.js
+++ b/lib/schema/subdocument.js
@@ -386,7 +386,7 @@ SchemaSubdocument.prototype.toJSON = function toJSON() {
  * ignore
  */
 
-SubdocumentPath.prototype.clone = function() {
+SchemaSubdocument.prototype.clone = function() {
   const schematype = new this.constructor(
     this.schema,
     this.path,