diff --git a/index.js b/index.js
index f1c90a0..5819f68 100644
--- a/index.js
+++ b/index.js
@@ -141,6 +141,7 @@ function extract(obj, options) {
     for (let p in paths) {
         if (obj.paths[p] && obj.paths[p].parameters) {
             src.paths[p].parameters = clone(obj.paths[p].parameters);
+            deref(src.paths[p].parameters,src,obj);
         }
     }