diff --git a/lib/types/subdocument.js b/lib/types/subdocument.js
index 1925e6c3528..61b53f0e45e 100644
--- a/lib/types/subdocument.js
+++ b/lib/types/subdocument.js
@@ -53,6 +53,7 @@ function Subdocument(value, fields, parent, skipId, options) {
     }
 
     delete options.priorDoc;
+    delete this.$__.$options.priorDoc;
   }
 }