diff --git a/packages/entity/list.js b/packages/entity/list.js
index 6852053..286e57d 100644
--- a/packages/entity/list.js
+++ b/packages/entity/list.js
@@ -57,11 +57,8 @@ class EntityListBase {
     const uuid = entity.instanceUuid;
     this.entities_PRIVATE[uuid] = entity;
     this.state_PRIVATE = this.state_PRIVATE.set(uuid, entity.state());
-    entity.addTrait('listed', {
-      params: {
-        list: this,
-      },
-    });
+    entity.addTrait('listed');
+    entity.list = this;
     const onEntityPositionChanged = () => {
       this.quadTree_PRIVATE.remove(this.quadTreePoint(entity));
       this.quadTree_PRIVATE.add(this.recomputeQuadTreePoint(entity));
diff --git a/packages/entity/traits/listed.js b/packages/entity/traits/listed.js
index 7269b97..0446b28 100644
--- a/packages/entity/traits/listed.js
+++ b/packages/entity/traits/listed.js
@@ -6,8 +6,6 @@ import {Rectangle, Vector} from '@avocado/math';
 export class Listed extends Trait {
 
   initialize() {
-    this._list = this.params.get('list');
-    this.params = this.params.delete('list');
     this.lastNearby = I.Set();
   }
 
@@ -15,6 +13,10 @@ export class Listed extends Trait {
     return this._list;
   }
 
+  set list(list) {
+    this._list = list;
+  }
+
   methods() {
     return {