diff --git a/module/item/entity.js b/module/item/entity.js
index a6101363..02824961 100644
--- a/module/item/entity.js
+++ b/module/item/entity.js
@@ -1559,7 +1559,7 @@ export default class Item5e extends Item {
    */
   _onCreateOwnedPower(data, actorData, isNPC) {
     const updates = {};
-    updates["data.prepared"] = true;       // Automatically prepare powers for everyone
+    updates["data.preparation.prepared"] = true;       // Automatically prepare powers for everyone
     return updates;
   }