diff --git a/packages/ecs/src/component/flat.js b/packages/ecs/src/component/flat.js
index e4da73d..7292959 100644
--- a/packages/ecs/src/component/flat.js
+++ b/packages/ecs/src/component/flat.js
@@ -28,6 +28,8 @@ export default class FlatComponent extends BaseComponent {
         const data = new ArrayBuffer(size);
         (new Uint8Array(data)).set(this.data);
         this.data = data;
+        this.Window = undefined;
+        this.window = undefined;
       }
       for (let i = 0; i < count; ++i) {
         results.push(this.caret++);