diff --git a/packages/physics/dummy/world.js b/packages/physics/dummy/world.js
index 6e027db..a257c37 100644
--- a/packages/physics/dummy/world.js
+++ b/packages/physics/dummy/world.js
@@ -30,7 +30,7 @@ export class World extends AbstractWorld {
     const aabb = body.aabb;
     const points = Rectangle.toPoints(aabb);
     const nodes = points.map((point) => [...point, body]);
-    this.quadTreeNodes = this.quadTreeNodes.set(body, nodes);
+    this.quadTreeNodes.set(body, nodes);
     for (const node of nodes) {
       this.quadTree.add(node);
     }