diff --git a/app/ecs/component.js b/app/ecs/component.js
index 854fdd0..9a2475e 100644
--- a/app/ecs/component.js
+++ b/app/ecs/component.js
@@ -61,13 +61,13 @@ export default class Component {
         }
       }
     }
-    const keys = new Set(Object.keys(defaults));
     const promises = [];
     for (let i = 0; i < entries.length; ++i) {
       const [entityId, values] = entries[i];
       const instance = allocated[i];
       instance.entity = entityId;
       this.instances[entityId] = instance;
+      const keys = new Set(Object.keys(defaults));
       for (const key in values) {
         keys.delete(key);
       }